how to find max and min value from .mat file and save it to an other array?

Question

Muhammad Umer 2015-9-22

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https://ww2.mathworks.cn/matlabcentral/answers/244450-how-to-find-max-and-min-value-from-mat-file-and-save-it-to-an-other-array

回答： Thorsten 2015-9-22

for i=1:10
    j(i)=i*0.5:
    end 
j = sort( j );
save('j.mat', 'j');

how can i find the max and min value from j.mat and save it to an other array?

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Answer 1

Thorsten 2015-9-22

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https://ww2.mathworks.cn/matlabcentral/answers/244450-how-to-find-max-and-min-value-from-mat-file-and-save-it-to-an-other-array#answer_193318

在 MATLAB Online 中打开

 S = load('j.mat', 'j');
 minmax = [min(S.j) max(S.j)];
 save('jminmax.mat', minmax);

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Answer 2

Nobel Mondal 2015-9-22

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https://ww2.mathworks.cn/matlabcentral/answers/244450-how-to-find-max-and-min-value-from-mat-file-and-save-it-to-an-other-array#answer_193310

在 MATLAB Online 中打开

Looks like the input array is already being sorted before saving into matfile. Now all you have to do is load the file, and get the first and last elements from the array.

 >> load j                   % Here j is the matfile name
 >> min_num = j(1);          % Here j is array variable name
 >> max_num = j(end);        % Here J is again variable name
 >> new_array = [min_num max_num];

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Muhammad Umer 2015-9-22

在 MATLAB Online 中打开

load j;
min_value=j(1);
max_value=j(end);
new_array = [min_value  max_value];

i am getting this error.

??? Undefined function or variable 'j'.
Error in ==> load_files at 2
min_value=j(1);

Nobel Mondal 2015-9-22

编辑：Nobel Mondal 2015-9-22

While saving the matfile, probably the variables were not saved properly. Can you try "clear all", then double click on the j.mat file and see if any variable comes up in the Workspace window?

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