avoid for loop in a specific code

Question

MA 2019-8-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/475669-avoid-for-loop-in-a-specific-code

评论： MA 2019-8-10

Could anyone help me if there is any way to avoid for loop in the following code: Both Target and predicted_target are vectors with n rows and one column.

new_classes=cell(size(Target,1),1);
for i=1:size(Target,1)
    if (strcmp(predicted_target(i),Target{i}))
        new_classes{i}=strcat('c',Target{i});
    else
        new_classes{i}=strcat('E',Target{i});
    end
end

3 个评论
显示 1更早的评论隐藏 1更早的评论

MA 2019-8-10

imagine that my data is as simple as that:

predicted_t=[ '1'; '0'; '0'; '1'];

Target=[ '0'; '1'; '1'; '1'];

So, I am expecting the new classes to be:

{'E0'}

{'E1'}

{'c1'}

Bruno Luong 2019-8-10

编辑：Bruno Luong 2019-8-10

@MA: You change cell array to char array, you change variable name predicted_target to predicted_t.

Please don't do that if you want getting exactly the code that works

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Bruno Luong 2019-8-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/475669-avoid-for-loop-in-a-specific-code#answer_387078

编辑：Bruno Luong 2019-8-10

在 MATLAB Online 中打开

predicted_target = {'1'; '0'; '0'; '1'};
Target = {'0'; '1'; '1'; '1'};
prefix = {'E'; 'c'}
new_classes = strcat(prefix(strcmp(predicted_target,Target)+1),Target)

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

MA 2019-8-10

在 MATLAB Online 中打开

Thank you. I just change the prefix, so the altered code is the following:

prefix=int2str(predicted_target==Target);
prefix(prefix=='1')='c';
prefix(prefix=='0')='E';
new_classes = strcat(prefix,Target);
new_classes=cellstr(new_classes);