三种调度算法报错 有实例

Question

我这边直接用的matlab是2024a版本
但是rate(j,frame) =snr2rate(snr(j,frame));这个语句一直报错
我自己修改之后 图片效果不如意 全部是一样的图
想知道应该如何修改
希望亲们可以自己跑一遍 还有报大
以下是我使用的

function []=nrtps_schedule(frame_num,user_num)
%RR, Max C/I, PF, WFQ
frame_num=100;
t_c = 0.0002058;
%time constant for PF
tc_pf = 5;
t_frame = 0.005;
user_num=300;

rr_throughput = 0;
rr_throughput_user = zeros(user_num,1);
rr_user_flag = 1;

maxci_throughput = 0;
maxci_throughput_user = zeros(user_num,1);

pf_throughput = 0;
pf_throughput_user = zeros(user_num,1);

wfq_throughput = 0;
wfq_throughput_user = zeros(user_num,1);

slot_remain_rr = 0;
slot_remain_maxci = 0;
slot_remain_pf = 0;
slot_remain_wfq = 0;

utilization_rr = zeros(1,frame_num);
total_throughput_rr = zeros(1,frame_num);
fi_rr = zeros(1,frame_num);

utilization_maxci = zeros(1,frame_num);
total_throughput_maxci = zeros(1,frame_num);
fi_maxci = zeros(1,frame_num);

utilization_pf = zeros(1,frame_num);
total_throughput_pf = zeros(1,frame_num);
fi_pf = zeros(1,frame_num);

utilization_wfq = zeros(1,frame_num);
total_throughput_wfq = zeros(1,frame_num);
fi_wfq = zeros(1,frame_num);

for i = 1:user_num
    for j =1:5
        maxci_pk(i,j).size = 0;
    end
end

for i = 1:user_num
    for j =1:5
        pf_pk(i,j).size = 0;
    end
end


%for PF
lamda_pf = ones(user_num,1); %ave_throughput,updating every allocation time

snr = zeros(user_num,frame_num);

for i = 1:user_num
    snr(i,:) = raylrnd(15,1,frame_num); 
end

% normal distribution
rsv_mu = 1200;
rsv_sigma = 100;
rsv_rate = normrnd(rsv_mu,rsv_sigma,user_num,1);
system_time = 0;

for frame = 1:frame_num
    frame_rr = zeros(11,30);
    frame_maxci = zeros(11,30);
    frame_pf = zeros(11,30);
    frame_wfq = zeros(11,30);
            
    rate = zeros(user_num,frame_num);
    
    for j = 1:user_num
        if snr(j,frame)<5
            snr(j,frame) = 5;
        end
        rate(j,frame) =snr2rate(snr(j,frame));
    end
    
    rtps_size_a = 0.12*8;
    rtps_size_b = 0.24*8;
    rtps_size = rtps_size_a + (rtps_size_b - rtps_size_a)* rand(user_num,5); % every user has 5 connections
    
    %for rr
    rr_rate = rate;
    %Round Robin
    rr_priority_lst = rtps_size;
       
    %for rr allocate the frame resource
    rr_slot_num = zeros(user_num,5);
    for j = 1:user_num
        for k = 1:5
            rr_slot_num(j,k) = ceil(rr_priority_lst(j,k)*1000/rr_rate(j,frame)/t_c);
        end
    end
    
    total_slot_rr = 330;
    rr_break_flag = 0;
    %round robin
    for j = rr_user_flag:user_num
        if rr_break_flag == 1
            break
        end
        for k = 1:5
            if rr_slot_num(j) > 0
                total_slot_rr = total_slot_rr - rr_slot_num(j,k);
                if (total_slot_rr < 0)
                    total_slot_rr = total_slot_rr + rr_slot_num(j,k);
                    rr_user_flag = j;
                    rr_break_flag = 1;
                    break
                else
                    frame_rr  = fill_ofdma_frame(frame_rr,rr_slot_num(j,k));
                    rr_throughput = rr_throughput + rr_priority_lst(j,k);
                    rr_throughput_user(j,1) = rr_throughput_user(j,1) + rr_priority_lst(j,k);
                end
            end
        end
    end
    
    if rr_user_flag ~= 1
        for j = 1:rr_user_flag-1
            if rr_break_flag == 1
                break
            end
            for k = 1:5
                if rr_slot_num(j) > 0
                    total_slot_rr = total_slot_rr - rr_slot_num(j,k);
                    if (total_slot_rr < 0)
                        total_slot_rr = total_slot_rr + rr_slot_num(j,k);
                        rr_user_flag = j;
                        rr_break_flag = 1;
                        break
                    else
                        frame_rr  = fill_ofdma_frame(frame_rr,rr_slot_num(j,k));
                        rr_throughput = rr_throughput + rr_priority_lst(j,k);
                        rr_throughput_user(j,1) = rr_throughput_user(j,1) + rr_priority_lst(j,k);
                    end
                end
             end
        end
    end
    slot_remain_rr = slot_remain_rr + total_slot_rr;
    
    %for max C/I
     maxci_rate = rate;
     snr_copy = snr;
   %for max C/I allocate the frame resource
    maxci_rate = rate;
    for i = 1:user_num
        for j =1:5
            if maxci_pk(i,j).size == 0 % the connection request has been served
                maxci_pk(i,j).size = rtps_size(i,j);
                maxci_pk(i,j).slot_num = ceil(rtps_size(i,j)*1000/maxci_rate(i,frame)/t_c);
            end
            maxci_pk(i,j).serv_flag = 0; % at the beginning of each frame, everyone is unserved
        end
    end
    
    total_slot_maxci = 330;
    while total_slot_maxci > 0
        %for maxci to find the one with biggest snr
        all_serve_flag = 0; % flag to indicate if all connections of a user has been served
        user_maxci_flag = 1;
        snr_maxci_max = snr_copy(1,frame);
        for j = 1:user_num
            if (snr_copy(j,frame) > snr_maxci_max)
                snr_maxci_max = snr_copy(j,frame);
                user_maxci_flag = j;
            end
        end
        
        %if the highest snr is 0, means all user has been served
        if(snr_copy(user_maxci_flag,frame) == 0)
            break
        end
        
        if maxci_pk(user_maxci_flag,5).size > 0 %the selected user is not empty
            % the user_pf_flag_th user is selected
            % serve all the connection request of the user
            for n = 1:5
                total_slot_maxci = total_slot_maxci - maxci_pk(user_maxci_flag,n).slot_num;%slot num decrease
                if total_slot_maxci < 0
                    total_slot_maxci = total_slot_maxci + maxci_pk(user_maxci_flag,n).slot_num;
                    break
                 else
                     frame_maxci  = fill_ofdma_frame(frame_maxci,maxci_pk(user_maxci_flag,n).slot_num);
                     maxci_pk(user_maxci_flag,n).serv_flag = 1; % indicate this connection has been served
                     maxci_throughput = maxci_throughput + maxci_pk(user_maxci_flag,n).size;
                     maxci_throughput_user(user_maxci_flag) = maxci_throughput_user(user_maxci_flag) + maxci_pk(user_maxci_flag,n).size;
                     maxci_pk(user_maxci_flag,n).size = 0; % clear the served pk 
                     if n == 5
                         all_serve_flag = 1; %if all connections of the user have been served, flag it, clear its snrcopy later
                     end
                 end
             end
             % record the selected user has been served
%              if all_serve_flag == 1
                 snr_copy(user_maxci_flag,frame) = 0;
%              end
         end
        
    end  % end of while
    
    %for PF
    pf_slot_num = zeros(user_num,1);
    pf_slot_used = zeros(user_num,1);
    pf_throughput_frame = zeros(user_num,1); %pf throughput per frame
        
    pf_rate = rate; %equal to R
    prio_pf = zeros(user_num,1);
    for j = 1:user_num
        prio_pf(j) = pf_rate(j,frame)/lamda_pf(j);
    end
    
    for i = 1:user_num
        for j =1:5
            if pf_pk(i,j).size == 0 % the connection request has been served
                pf_pk(i,j).size = rtps_size(i,j);
                pf_pk(i,j).slot_num = ceil(rtps_size(i,j)*1000/pf_rate(i,frame)/t_c);
            end
            pf_pk(i,j).serv_flag = 0; % at the beginning of each frame, everyone is unserved
        end
    end
    
    total_slot_pf = 330;
    while total_slot_pf >= 0
        d_pf = zeros(user_num,1); %actual transmission rate,every allocation time needs updating
        
        %for PF find the user with biggest priority
        user_pf_flag = 1;
        prio_pf_max = prio_pf(1);
        for j = 1:user_num
            if (prio_pf(j) > prio_pf_max)
            prio_pf_max = prio_pf(j);
            user_pf_flag = j;
            end
        end
        
        %if the highest priority is zero: means all users have been served
        if (prio_pf(user_pf_flag) == 0)
            break
        end
                
        if (pf_pk(user_pf_flag,5).size > 0) %the selected user is not empty
            %the user_pf_flag_th user is selected
             
            %serve all the connection request of the user
            for n = 1:5
               total_slot_pf = total_slot_pf - pf_pk(user_pf_flag,n).slot_num;  %slot num decrease
                if total_slot_pf < 0
                   break
                else
                    pf_slot_used(user_pf_flag,1) = pf_slot_used(user_pf_flag,1) + pf_pk(user_pf_flag,n).slot_num;
                    frame_pf  = fill_ofdma_frame(frame_pf,pf_pk(user_pf_flag,n).slot_num);
                    pf_throughput = pf_throughput + pf_pk(user_pf_flag,n).size;
                    pf_throughput_frame(user_pf_flag) = pf_throughput_frame(user_pf_flag) + pf_pk(user_pf_flag,n).size;
                    pf_throughput_user(user_pf_flag) = pf_throughput_user(user_pf_flag) + pf_pk(user_pf_flag,n).size;
                    pf_pk(user_pf_flag,n).size = 0; % clear the served pk 
                    pf_pk(user_pf_flag,n).serv_flag = 1; % indicate this connection has been served
                end
            end
                      
        end
        %record the user selected has been served
        prio_pf(user_pf_flag) = 0;
        
    end %end of while
    
    if total_slot_pf < 0
        total_slot_pf = total_slot_pf + pf_pk(user_pf_flag,n).slot_num; %not enough slots
    end
    
    %updating related parameters after per frame
    for j = 1:user_num  
        if pf_slot_used(j,1) > 0
            d_pf(j) = (pf_throughput_frame(j)*1000/(pf_slot_used(j,1)*t_c));
        else
            d_pf(j) = 0;
        end
    end
    for j = 1:user_num
        lamda_pf(j) = (1 - 1/tc_pf)*lamda_pf(j) + d_pf(j)/tc_pf;
    end
    slot_remain_pf = slot_remain_pf + total_slot_pf;
    
    % WFQ
    arv_time_a = 0;
    arv_time_b = t_frame;
    arv_time = arv_time_a + (arv_time_b - arv_time_a)*rand(user_num,5);
    
    wfq_slot_num = zeros(user_num,1);
    wfq_throughput_frame = zeros(user_num,1); %WFQ throughput per frame
    
    if frame == 1
        % the first frame, initialization
        for i = 1:user_num
            for j = 1:5
                wfq_pk(i,j).pre_fi_time = 0;
                wfq_pk(i,j).size = rtps_size(i,j);
                wfq_pk(i,j).rsv_rate = rsv_rate(i);
                wfq_pk(i,j).rate = rate(i,frame);
                wfq_pk(i,j).arv_time = arv_time(i,j);
                % compute the vitual time
                temp_virtual_time = system_time + wfq_pk(i,j).arv_time;
                wfq_pk(i,j).finish_time = max(wfq_pk(i,j).pre_fi_time,temp_virtual_time) + wfq_pk(i,j).size*1000/wfq_pk(i,j).rsv_rate;
            end
        end
    else
        for i = 1:user_num
            for j = 1:5
                % for the served pk in previous frame
                if wfq_pk(i,j).size == 0
                    wfq_pk(i,j).size = rtps_size(i,j);
                    wfq_pk(i,j).pre_fi_time = wfq_pk(i,j).finish_time;
                    wfq_pk(i,j).arv_time = arv_time(i,j);
                    % compute the vitual time
                    temp_virtual_time = system_time + wfq_pk(i,j).arv_time;
                    wfq_pk(i,j).finish_time = max(wfq_pk(i,j).pre_fi_time,temp_virtual_time) + wfq_pk(i,j).size*1000/wfq_pk(i,j).rsv_rate;
                end
                wfq_pk(i,j).rate = rate(i,frame); % the traffic rate needs updating in each frame
            end
        end
    end
    
    % bubble sort finish time inside each user
    for i = 1:user_num
        exchange_flag = 0;
        for exchange_times = 4:-1:1
            for j = 1:exchange_times
                if wfq_pk(i,j).finish_time > wfq_pk(i,j+1).finish_time 
                    tmp_wfq_pk = wfq_pk(i,j);
                    wfq_pk(i,j) = wfq_pk(i,j+1);
                    wfq_pk(i,j+1) = tmp_wfq_pk;
                    exchange_flag = 1;
                end
            end
            if (exchange_flag == 0)
                break
            end
        end
    end
    
    total_slot_wfq = 330;
    wfq_serv_num = 0;
    wfq_all_serv = zeros(user_num,1); %the flag array to indicate whether the request of a user has been all served
    while total_slot_wfq >= 0
        %for WFQ find the user with smallest finish time
        user_wfq_flag = 0;
        fi_time_wfq_min = 1000; %NaN   
        for i = 1:user_num
            if wfq_all_serv(i,1) == 0
                if wfq_pk(i,1).finish_time < fi_time_wfq_min
                    fi_time_wfq_min = wfq_pk(i,1).finish_time;
                    user_wfq_flag = i;
                end
            end
        end
        
        if wfq_serv_num == user_num*5
            % all request have been served
            break
        end
        
        if wfq_pk(user_wfq_flag,1).size == 0
            wfq_all_serv(user_wfq_flag,1) = 1;            
        else
            wfq_slot_num(user_wfq_flag) = ceil(wfq_pk(user_wfq_flag,1).size*1000/(t_c*wfq_pk(user_wfq_flag,1).rate));
            total_slot_wfq = total_slot_wfq - wfq_slot_num(user_wfq_flag);%slot num decrease
            if total_slot_wfq < 0
                total_slot_wfq = total_slot_wfq + wfq_slot_num(user_wfq_flag);%not enough slots
                break
            else
                frame_wfq  = fill_ofdma_frame(frame_wfq,wfq_slot_num(user_wfq_flag));
                wfq_throughput = wfq_throughput + wfq_pk(user_wfq_flag,1).size;
                wfq_throughput_frame(user_wfq_flag) = wfq_throughput_frame(user_wfq_flag) + wfq_pk(user_wfq_flag,1).size;
                wfq_throughput_user(user_wfq_flag) = wfq_throughput_user(user_wfq_flag) + wfq_pk(user_wfq_flag,1).size;
                wfq_serv_num = wfq_serv_num + 1;
            end
        end
        
        % have finished serving the (user_wfq_flag,1) pk, move on
        tmp_wfq_pk = wfq_pk(user_wfq_flag,1);
        for j = 1:4
            wfq_pk(user_wfq_flag,j) = wfq_pk(user_wfq_flag,j+1);
        end
        wfq_pk(user_wfq_flag,5) = tmp_wfq_pk;
        wfq_pk(user_wfq_flag,5).size = 0; % means this pk has been served            
    end % end of while
    
    %update system time
    system_time = system_time + t_frame;
    
    
    
    
    %statistics
    %for RR
    utilization_rr(1,frame) = (330*frame - slot_remain_rr)/(330*frame);
    total_throughput_rr(1,frame) = rr_throughput/(t_frame*frame);
    a = 0;
    b = 0;
    for j = 1:user_num
        a = a + rr_throughput_user(j,1);
        b = b + rr_throughput_user(j,1).^2;
    end
    fi_rr(1,frame) = a.^2/(user_num*b);
    
    %for max C/I
    utilization_maxci(1,frame) = (330*frame - slot_remain_maxci)/(330*frame);
    total_throughput_maxci(1,frame) = maxci_throughput/(t_frame*frame);
    a = 0;
    b = 0;
    for j = 1:user_num
        a = a + maxci_throughput_user(j,1);
        b = b + maxci_throughput_user(j,1).^2;
    end
    fi_maxci(1,frame) = a.^2/(user_num*b);
    
    %for PF
    utilization_pf(1,frame) = (330*frame - slot_remain_pf)/(330*frame);
    total_throughput_pf(1,frame) = pf_throughput/(t_frame*frame);
    a = 0;
    b = 0;
    for j = 1:user_num
        a = a + pf_throughput_user(j,1);
        b = b + pf_throughput_user(j,1).^2;
    end
    fi_pf(1,frame) = a.^2/(user_num*b); 
    
    %for WFQ
    total_throughput_wfq(1,frame) = wfq_throughput/(t_frame*frame);
    a = 0;
    b = 0;
    for j = 1:user_num
        a = a + wfq_throughput_user(j,1);
        b = b + wfq_throughput_user(j,1).^2;
    end
    fi_wfq(1,frame) = a.^2/(user_num*b); 
    
    %another way for fairness measurement: min-max ratio:fi_minmax = throughput_min/throughput_max;
    %fi_rr_minmax: fairness for RR
    throughput_rr_min = rr_throughput_user(1,1);
    throughput_rr_max = rr_throughput_user(1,1);
    for j = 1:user_num
        if rr_throughput_user(j,1) > throughput_rr_max
            throughput_rr_max = rr_throughput_user(j,1);
        end
        if rr_throughput_user(j,1) < throughput_rr_min
            throughput_rr_min = rr_throughput_user(j,1);
        end
    end
    fi_rr_minmax(1,frame) = throughput_rr_min/throughput_rr_max;
    
    %fi_maxci_minmax: fairness for Max C/I
    throughput_maxci_min = maxci_throughput_user(1,1);
    throughput_maxci_max = maxci_throughput_user(1,1);
    for j = 1:user_num
        if maxci_throughput_user(j,1) > throughput_maxci_max
            throughput_maxci_max = maxci_throughput_user(j,1);
        end
        if maxci_throughput_user(j,1) < throughput_maxci_min
            throughput_maxci_min = maxci_throughput_user(j,1);
        end
    end
    fi_maxci_minmax(1,frame) = throughput_maxci_min/throughput_maxci_max;
    
    %fi_pf_minmax: fairness for PF
    throughput_pf_min = pf_throughput_user(1,1);
    throughput_pf_max = pf_throughput_user(1,1);
    for j = 1:user_num
        if pf_throughput_user(j,1) > throughput_pf_max
            throughput_pf_max = pf_throughput_user(j,1);
        end
        if pf_throughput_user(j,1) < throughput_pf_min
            throughput_pf_min = pf_throughput_user(j,1);
        end
    end
    fi_pf_minmax(1,frame) = throughput_pf_min/throughput_pf_max;
    
    %fi_wfq_minmax: fairness for WFQ
    throughput_wfq_min = wfq_throughput_user(1,1);
    throughput_wfq_max = wfq_throughput_user(1,1);
    for j = 1:user_num
        if wfq_throughput_user(j,1) > throughput_wfq_max
            throughput_wfq_max = wfq_throughput_user(j,1);
        end
        if wfq_throughput_user(j,1) < throughput_wfq_min
            throughput_wfq_min = wfq_throughput_user(j,1);
        end
    end
    fi_wfq_minmax(1,frame) = throughput_wfq_min/throughput_wfq_max;
    
end % end of a frame


fi_rr(1,frame_num);
fi_rr_minmax(1,frame_num);
total_throughput_rr(1,frame_num);
%utilization_rr(1,frame_num)

fi_maxci(1,frame_num);
fi_maxci_minmax(1,frame_num);
total_throughput_maxci(1,frame_num);
%utilization_maxci(1,frame)

fi_pf(1,frame_num);
fi_pf_minmax(1,frame_num);
total_throughput_pf(1,frame_num);
%utilization_pf(1,frame_num)

%draw figure
%1.Jain公平性指数
    frame = 1:frame_num;
    figure;
    plot(frame,fi_rr,'r',frame,fi_maxci,'b',frame,fi_pf,'g',frame,fi_wfq,'y');
    %plot(frame,fi_rr_minmax,'r',frame,fi_maxci_minmax,'b',frame,fi_pf_minmax,'g');
    legend('RR','Max C/I','PF','WFQ');
    %plot(frame,fi_rr,'r',frame,fi_maxci,'b');
    axis([1 frame_num 0 1]);
    xlabel('帧数');
    ylabel('Jain公平性指数');
%2.Minmax公平性指数
    frame = 1:frame_num;
    figure;
    %plot(frame,fi_rr,'r',frame,fi_maxci,'b',frame,fi_pf,'g');
    plot(frame,fi_rr_minmax,'r',frame,fi_maxci_minmax,'b',frame,fi_pf_minmax,'g',frame,fi_wfq_minmax,'y');
    legend('RR','Max C/I','PF','WFQ');
    %plot(frame,fi_rr,'r',frame,fi_maxci,'b');
    axis([1 frame_num 0 1]);
    xlabel('帧数');
    ylabel('MinMax公平性指数');
%3.吞吐量
%plot(frame,fi_index,'o');
%hold on;
    frame = 1:frame_num;
    figure;
    plot(frame,total_throughput_rr,'r',frame,total_throughput_maxci,'b',frame,total_throughput_pf,'g',frame,total_throughput_wfq,'y');
    legend('RR','Max C/I','PF','WFQ');
    %plot(frame,total_throughput_rr,'r',frame,total_throughput_maxci,'b');
    %axis([1 frame_num 100000 200000]);
    xlabel('帧数');
    ylabel('吞吐量(bps)');
%4.每个用户的吞吐量和minimum reserved rate的比较
for i = 1:user_num
    rr_throughput_user(i,1) = rr_throughput_user(i,1)/(frame_num*t_frame);
    maxci_throughput_user(i,1) = maxci_throughput_user(i,1)/(frame_num*t_frame);
    pf_throughput_user(i,1) = pf_throughput_user(i,1)/(frame_num*t_frame);
    wfq_throughput_user(i,1) = wfq_throughput_user(i,1)/(frame_num*t_frame);
end

user = 1:user_num;
figure;
plot(user,rsv_rate,'r-*',user,rr_throughput_user,'b-o');
legend('Minimum Reserved Rate','RR');
xlabel('用户数');
ylabel('RR Rate(bps)');

figure;
plot(user,rsv_rate,'r-*',user,maxci_throughput_user,'b-o');
legend('Minimum Reserved Rate','Max C/I');
xlabel('用户数');
ylabel('Max C/I Rate(bps)');

figure;
plot(user,rsv_rate,'r-*',user,pf_throughput_user,'b-o');
legend('Minimum Reserved Rate','PF');
xlabel('用户数');
ylabel('PF Rate(bps)');

figure;
plot(user,rsv_rate,'r-*',user,wfq_throughput_user,'b-o');
legend('Minimum Reserved Rate','WFQ');
xlabel('用户数');
ylabel('WFQ Rate(bps)');

return

return

Answer 1

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根据您提供的错误信息，问题在于MATLAB找不到名为snr2rate的函数或变量。这意味着要么这个函数没有被正确定义，要么在调用它之前没有加载相应的文件或工具箱。为了解决这个问题，请按照以下步骤操作：

确认函数定义

首先，确保snr2rate函数已经被正确定义并且存在于您的MATLAB路径中。如果您是直接从某个教程或示例中复制了代码，请检查是否遗漏了定义snr2rate的部分。这个函数应该是用来将信噪比(SNR)转换为数据速率的一个自定义函数。

如果您有snr2rate函数的定义：

1. 确认文件位置：确保包含snr2rate函数的.m文件位于MATLAB的搜索路径上。可以通过pathtool命令打开路径编辑器检查和添加路径。

2. 检查函数定义：确认snr2rate函数的文件名与函数名匹配，并且函数定义正确无误。例如，一个基本的snr2rate函数定义可能看起来像这样：

   function rate = snr2rate(snr)
       % 这里是将SNR转换为数据速率的逻辑
       % 示例简单线性关系，实际应用中应根据模型调整
       rate = someFunctionOfSNR(snr); % 请替换为正确的转换逻辑
   end
   

如果您没有snr2rate函数的定义：

您需要创建这个函数。如果您不知道具体的转换逻辑，可以先用一个简单的示例占位，比如基于SNR的线性或对数关系。之后根据实际需求细化逻辑。

示例占位代码：

function rate = snr2rate(snr)
    % 示例：假设SNR每增加1dB，速率增加一定值（这里仅作示例，实际情况更复杂）
    rate = snr * someConstant; % someConstant需根据实际模型确定
end

加载函数

• 如果函数是在另一个脚本或函数中定义的，确保调用nrtps_schedule之前已经运行了定义snr2rate的代码。
• 如果它是单独的.m文件，确保该文件已经添加到了MATLAB路径中，或者直接在调用前使用addpath临时添加其所在目录。

完成上述步骤后，再次尝试运行您的代码，应该能解决snr2rate未定义的错误。如果还有其他问题，请提供更详细的信息，以便进一步协助。