How to apply a function to an specific column of all variables?

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Larissa Perez
Larissa Perez 2016-11-17
评论： Larissa Perez 2016-11-18
Hi everyone! I'm new to Matlab, so I'm sure this is a silly question.
I have about 20 variables, all same size matrix. I would like to turn all the values above 50 or below -50 in the first column into NaN, for all the variables. Can someone help me with that? This is what I have been trying to do:
myvars = who;
for i = 1:length(myvars)
data = eval(myvars{i});
shear = data(:,1);
shear(shear>50)=NaN;
shear(shear<-50)=NaN;
data(:,1) = shear;
eval(myvars{1}) = data;
end
  1 个评论
KSSV
KSSV 2016-11-17
You have variables saved in workspace which are matrices and in there in first column you want nan? What problem you are facing now with the above code?

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采纳的回答

James Tursa
James Tursa 2016-11-17
编辑：James Tursa 2016-11-17
Try this:
eval([myvars{i} ' = data']);

更多回答（1 个）

Jan
Jan 2016-11-17
Don't do this. It is a bad programming style, because it impedes the debugging and performance. You find many discussions in this forum concerning eval, e.g. http://www.mathworks.com/matlabcentral/answers/194902-how-can-use-a-for-loop-to-name-a-matrix#answer_172980.
  2 个评论
Larissa Perez
Larissa Perez 2016-11-18
I have tried reorganizing my data in 6 structures that I called m1-m6, and tried the following code. Still didn't work, don't know what's wrong :(
location = {'m1','m2','m3','m4','m5','m6'};
for i = 1:6
fields1=fieldnames(m1);
fields2=fieldnames(m2);
fields3=fieldnames(m3);
fields4=fieldnames(m4);
fields5=fieldnames(m5);
fields6=fieldnames(m6);
fields = {'fields1','fields2','fields3','fields4','fields5','fields6'};
loop = getfield (location{i},{fields{i}});
end
It doesn't seem to like using fields{i}

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