①报错：第一行不是matlab所需的表达式②输入的参数数目不足这两个问题怎么改呀

Question

function [local] =getLocalMaximum(M,m1,m2,np)
% the function is to get the few local maximums in a matrix
% M is traget matrix
% m1m1 the size of local matrix
% np is the total of the local maximum
% the format of local is abscissa value, ordinate value, maxumum
[a,b] = size(M);
local = zeros(fix(a/m1b/m2)*np,3);
n = 0;
[a,b] = size(M);
subMatrix = zeros(m1,m2); % local matrix
for x = 1:m1/2:a
for y = 1:m2:b
if x+m1-1 <= a && y+m2-1 <= b
subMatrix = M(x:x+m1-1,y:y+m2-1);
s = sort(subMatrix(:),'descend');
for k = 1:np
[r,c] = find(M == s(k));
n = n+1;
local(n,:) = [r,c,s(k)];
end
end
end
end