Creating a variable from part of a string

I have a string:

    x='dr_1e-2_A1_OFF_A2_OFF.txt';

Is there a way to create variables from this string?

How can I set

dr = 1e-2

by only referring to the string? How can I set

A1 = 0 (since Off)

by only referring to the string?

Then if I want to create a title from the variables, could I?

Like:

title('dr = ' insert dr variable )

[Stephen23]

"Then if I want to create a title from the variables, could I?"

You certainly could... but this is not recommended. Magically creating variable names is one way that beginners force themselves into writing slow, complex, buggy code which is hard to debug. Read this to know why:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Answer 1

[Stephen23]

I recommend that you use a structure instead of magically accessing variable names:

>> x = 'dr_1e-2_A1_OFF_A2_OFF.txt';
>> [~,N] = fileparts(x);
>> C = regexp(N,'_','split');
>> S = struct(C{:});
>> S.dr
ans = 1e-2
>> S.A1
ans = OFF
>> S.A2
ans = OFF

You can easily add a conversion to numeric as well:

>> [~,N] = fileparts(x);
>> C = regexp(N,'_','split');
>> V = str2double(C);
>> X = ~isnan(V);
>> C(X) = num2cell(V(X));
>> S = struct(C{:});
>> S.dr
ans = 0.010000

"Then if I want to create a title from the variables,could I?"

Of course, read about fieldnames and dynamic field names:

https://www.mathworks.com/help/matlab/matlab_prog/generate-field-names-from-variables.html

[James Tursa]

+1 Clever use of fileparts!

[Stephen23]

Thank you! It just removes the file extension...

[James Tursa]

Yikes! The rest of my edited comment didn't make it, re the splitting and struct stuff ...