Remove for-loop by using cellfun
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Christophe
am 3 Jul. 2014
Bearbeitet: James Tursa
am 3 Jul. 2014
var_name = {'A','B','C'};
for i=1:length(var_name)
eval([cell2mat(var_names(i)) '=zeros(10,1);'])
end
How can I do?
Thanks in advance
3 Kommentare
Cedric
am 3 Jul. 2014
Bearbeitet: Cedric
am 3 Jul. 2014
If all "variables" contents are 10x1 numeric arrays, it would be much more natural/efficient (and simpler) to build an array of zeros. For 3 "variables", for example:
nData = 3 ;
data = zeros( 10, nData ) ;
and then use e.g.
data(:,2) = ...
to get the column vector for the second data.
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James Tursa
am 3 Jul. 2014
Bearbeitet: James Tursa
am 3 Jul. 2014
You can't avoid the for loop. Either it will be explicitly in your code, or whatever MATLAB function you use will have it in the background. It isn't a big deal in your case, so I would just advise keeping it explicit. Makes your code more readable anyway. E.g.,
z = zeros(10,1);
for i=1:length(var_name)
eval([var_names{i} '=z;'])
end
The reason for doing the "z = zeros(10,1)" up front is to create shared data copies of the 10x1 zeros matrix instead of individual ones. For you small example (106 variables) it won't make any practical difference in timing, but I thought I would include this option just for completeness of the example.
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Robert Cumming
am 3 Jul. 2014
Create the dynamic variables inside a struct instead of using eval
var_name = {'A','B','C'};
for i=1:length(var_name)
myStruct.(var_name{i}) = zeros(10,1);
end
the cyclist
am 3 Jul. 2014
Bearbeitet: John D'Errico
am 3 Jul. 2014
Please tell us you are not naming those 106 variables A,B,C, ..., AA, AB, AC, etc!
Could you do this via a cell array instead?
for n = 1:106
A{n} = zeros(10,1);
end
and use those as your variables?
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