Lets say I have 100 variables in Matlab workspace. For example I take 5 variables here:
Matrix
Sum
Addition
Area
Perimeter
Subtraction
...and so forth.
How can I select or filter out a variable name based on some keyword likeAdd or a search term which selects the variable Addition in the workspace. I used the who command as
who -regexp Add
But this only displays the name of the variable and not its value.
One of the rare occasions where eval is possibly the most appropriate approach. (gasp)
You can use the functional version (see: Syntax) of who to store the names of the variables that match the regex in a cell array. If you iterate over these names with eval it will behave as if they were being called from the command line, which will display their values if not suppressed.
For example:
Matrix = rand(3);
Sum = rand(3);
Addition = rand(3);
Area = rand(3);
Perimeter = rand(3);
Subtraction = rand(3);
Additional = rand(3);
vars = who('-regexp', '[Aa]dd');
for ii = 1:numel(vars)
eval(vars{ii})
end
Displays:
Addition =
0.8143 0.3500 0.6160
0.2435 0.1966 0.4733
0.9293 0.2511 0.3517
Additional =
0.6892 0.0838 0.1524
0.7482 0.2290 0.8258
0.4505 0.9133 0.5383
FilteredVars.(vars{ii})=eval(vars{ii}) to store them in a struct which, when explored in the workspace would only contain your variables. However, note you would be duplicating all those variables in memory, and they would not be linked to the actual values in the workspace.