Matlab saving file as name defined within other variable

2
votes

I want to load multiple variables into one .mat file at the end of a process loop. I have a simple line of code :

save draw.mat Output

but I cannot work out a way to code 'use the name given by variable X' instead of 'Output', so that I can loop the process and save multiple variables in draw.mat

So then

X = 'Chocolate'

and the Variable name is saved as Chocolate.

I am sure it is simple but I cannot find a solution on here!

3
matlabvariablessave

3 Answers

2
votes

You can use the -struct form of the save command. You build a struct with fields holding the names of the variables in the resulting .mat-file.

Example:

s = struct();
s.VariableOne = 1;
s.VariableTwo = 2;
save draw.mat -struct s;

The file draw.mat will now hold two 1x1 double variables with names "VariableOne" and "VariableTwo".

You can also build the struct in one single command:

s = struct('VariableOne', {1}, 'VariableTwo', {2});

Or you can use the cell2struct function:

data = {1,2};
names = {'VariableOne', 'VariableTwo'};
s = cell2struct(data(:), names(:), 1);
4
votes

You need the functional form of SAVE. In other words, SAVE can be called like this:

save('draw.mat', 'Output1', 'Output2');

So, if your variable names to save are in a separate variable, you could do

v1 = 'Output1';
v2 = 'Output2';
save('draw.mat', v1, v2);

Or even

v = {'Output1', 'Output2'};
save('draw.mat', v{:});

The SAVE reference page has full details.

0
votes

Let 

A = [2 5 8; 25 2 4; 4 1 7];
save('A.mat')

Now you want to save it with other name say B

B = A;
save('B.mat')