matlab报错大家帮我看看

Question

在matlab上写了一段求皮尔逊的代码，如下：
subjfolder = dir('C:\Users\33796\Desktop\Data');
subjfolder(1:2) = [ ];
for subji =1:30
subname = double(subjfolder(subji).name);
data=load([subjfolder(subji).folder '' subname]);
for i=1:2290
for j=1:2290
[r,p]=corr(data(i,:),data(j,:),'type','pearson'); //这句报错说输入必须为单精度或者双精度浮点值，不知道怎么改
Pc(i,j)=r;
end
end

Answer 1

这个错误是因为corr函数需要输入的是单精度或双精度浮点数组，而不是整数数组。因此，您需要将data数组转换为浮点数数组，可以使用以下语句来实现：

data = double(data);

在您的代码中，您还使用了一个错误的语法，即在for循环中使用了for作为循环变量，请将其替换为正确的循环变量名称。

此外，您还有一个缩写错误，即subjfolder(subii)，应该是subjfolder(subji)。

最终代码如下：

subjfolder = dir('C:\Users\133796\Desktop\Data');
subjfolder(1:2) = [];
for subji = 1:30
subname = double(subjfolder(subji).name);
data = load([subjfolder(subji).folder '' subname]);
data = double(data);
for i = 1:2290
for j = 1:2290
[r, p] = corr(data(i,:), data(j,:), 'Type', 'Pearson');
PC(i,j) = r;
end
end
end

subjfolder = dir('C:\Users\133796\Desktop\Data');
subjfolder(1:2) = [];
for subji = 1:30
subname = double(subjfolder(subji).name);
data = load([subjfolder(subji).folder '' subname]);
data = double(data);
for i = 1:2290
for j = 1:2290
[r, p] = corr(data(i,:), data(j,:), 'Type', 'Pearson');
PC(i,j) = r;
end
end
end