How do I insert many variables(upto 100) into one function?
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I have variables with value
B1=1 B2=2 B3=4 B4 ... B100= some number
(it goes on to 100 variables)
then I want to insert all of these variables into one function
save('filename.mat', 'B1', 'B2', 'B3'.... 'B100')
However, it will be very counterproductive to write all the 100 variables...
how do i shorten this function?
1 Comment
John D'Errico
on 25 Feb 2014
Perhaps this is a good time for you to learn NOT to name all of your variables like that, and instead learn how to use a vector. Vectors are new things in MATLAB, I think introduced in version 1 of the software, so really rather new.
Accepted Answer
Rick Rosson
on 25 Feb 2014
B = zeros(100,1);
B(1) = 1;
B(2) = 2;
B(3) = 4;
B(4) = ...
B(5) = ...
...
...
B(100) = ...
save('filename.mat', 'B');
4 Comments
More Answers (2)
Star Strider
on 25 Feb 2014
This seems a bit inelegant but it works:
B1=1; B2=2; B3=4;
for k1 = 1:3
B(k1) = eval(sprintf('B%d', k1));
end
You would then save vector B in your save command.
2 Comments
Star Strider
on 25 Feb 2014
Edited: Star Strider
on 25 Feb 2014
You can always refer to them by their subscripts, since those correspond to the names you’ve given the original variables.
With respect to vector B:
B(1) = B1;
B(2) = B2;
.
.
.
B(100) = B100;
Then, for example, refer to B(1) in your code rather than B1, etc.
Unless there is some problem with this (creating a vector B out of the original set of B variables) that you are not telling us about, this is not only easier to work with but much more efficient.
If the B variables are instead vectors of different lengths, and you are having problems creating a matrix from them, MATLAB can do that very efficiently with cell arrays.
We need to know what you want to do in much more detail, and specifically why creating the B vector does not work for you.
Walter Roberson
on 25 Feb 2014
save('filename.mat', 'B\d+')
This syntax is not well documented in the save() document. It is just barely hinted at: notice that there is an entry for "regular expression" in the Tips section of the page.
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