help with this problem

Question

Abdelmalek Benaimeur 2019-4-26

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/458746-help-with-this-problem

回答： Ruba 2023-6-27

采纳的回答： Jan

在 MATLAB Online 中打开

hello,

i'm working on appdesigner

i want to add a push button which allow me to load mat file and show its elements in the workspace

for example i have ''example.mat" it conatins 03 matrix A,B and C

i did this

[file,path] = uigetfile('*.mat', 'Select a File');
if isequal(file,0)
    disp('User selected Cancel')
else
    load(fullfile(path,file))
    assignin('base',file)
end

but i got this error

Error using assignin
Not enough input arguments.
Error in app1/LoadButtonPushed (line 18)
                assignin('base',file)
 
Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 335)
Error while evaluating Button PrivateButtonPushedFcn.

how can i solve this problem

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Answer 1

Jan 2019-4-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/458746-help-with-this-problem#answer_372445

在 MATLAB Online 中打开

The error message is clear: See doc assignin to see, that it requires 3 arguments:

data = load(fullfile(path,file))
assignin('base', 'data', data)

It is much safer to catch the imported data in a variable instead of polluting the workspace. Imagine the MAT file contains a variable called "assignin". Then the line: assignin('base', 'data', data) shows the evil problem.

By the way, do not use the important Matlab function "path" as name of a variable. This can cause serious problems, when you debug the code.