How to selectively save the names and values of some workspace variables to a CSV file?

조회 수: 3 (최근 30일)
Consider the following
a = 3; b=7; c=5; d=9;
save('test.mat')
data = load('test.mat');
toSave = { 'b' ; 'c' };
writecell( horzcat( toSave , <missing code> ) ,'myfile.csv')
what should be the <missing code> in order to have the content of myfile.csv to be
b , 7
c , 5
?

채택된 답변

Rik
Rik 2020년 9월 15일
This should do the trick. If the variables aren't scalars the results might not be what you want.
a = 3; b=7; c=5; d=9;
save('test.mat')
data = load('test.mat');
toSave = { 'b' ; 'c' };
s=struct;
for n=1:numel(toSave)
s.(toSave{n})=data.(toSave{n});
end
writecell( horzcat( toSave , struct2cell(s) ) ,'myfile.csv')
  댓글 수: 3
Rik
Rik 2020년 9월 15일
You could also ask load to only retrieve the variables of interest:
s=load('test.mat',toSave{:});
Note that loops have a pretty good performance, as long as you aren't dynamically growing arrays and there isn't a direct function to do it.
Diaa
Diaa 2020년 9월 15일
I totally forgot the simple way of selective loading.
Thanks for the hint.

댓글을 달려면 로그인하십시오.

추가 답변 (1개)

Diaa
Diaa 2020년 9월 15일
Thanks to the inspiring answer of @Rik, I found the following solution without the need to use for loop
a = 3; b=7; c=5; d=9;
save('test.mat')
data = load('test.mat');
toSave = { 'b' ; 'c' };
writecell(horzcat(toSave, cellfun( @(C) data.(C),toSave,'UniformOutput',false)),'myfile.csv')
  댓글 수: 2
Rik
Rik 2020년 9월 15일
cellfun will only hide the loop. In general it will be slower that a well-written for loop. Just something to be aware of.
Diaa
Diaa 2020년 9월 15일
You are right, but I can't resist minimizing the code despite knowing it is not the best practice :)

댓글을 달려면 로그인하십시오.

카테고리

Help CenterFile Exchange에서 Matrix Indexing에 대해 자세히 알아보기

제품


릴리스

R2020a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by