How do I insert many variables(upto 100) into one function?
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Hoon
el 25 de Feb. de 2014
Comentada: Walter Roberson
el 25 de Feb. de 2014
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 comentario
John D'Errico
el 25 de Feb. de 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.
Respuesta aceptada
Rick Rosson
el 25 de Feb. de 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 comentarios
Walter Roberson
el 25 de Feb. de 2014
If the vectors are different sizes then you could use a cell array.
Más respuestas (2)
Star Strider
el 25 de Feb. de 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 comentarios
Star Strider
el 25 de Feb. de 2014
Editada: Star Strider
el 25 de Feb. de 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
el 25 de Feb. de 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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