How to generate different filename with each iteration of code?

I am using the following synetex of matlab code

saveas(f, path + var + method + '.png');

where var and method are changing in each iteration. I mean there are two methods and two vars as follows

I wish to generate four png files with the combination of methods and vars using following code.

path = 'C:\chahar\';
methods = {'OLS', 'RF'};
dependent_vars = {'act_y_ha', 'act_per_ha'};
for m = 1:length(methods)
    method = methods(m);
    for jj = 1:numel(dependent_vars)
        var = dependent_vars{jj};
        % Save the figure
        saveas(f, path + method + var + '.png');          
    end      
end

Please suggest me how to fix the error as follows

Arrays have incompatible sizes for this operation.

saveas(f, path + var + method + '.png');

Related documentation

Answer 1

[Voss]

mypath = "C:\"; % string (with double quotes)
methods = {'OLS', 'RF'};
dependent_vars = {'act_y_ha', 'act_per_ha'};

% string concatenation 
filenames = mypath + dependent_vars.' + methods + '.png'

filenames = 2×2 string array
    "C:\act_y_haOLS.png"      "C:\act_y_haRF.png"  
    "C:\act_per_haOLS.png"    "C:\act_per_haRF.png"

[Devendra]

Thanks for your suggestion. I want to save the figures with these names using the matlab command as follows

% string concatenation 
filenames = mypath + dependent_vars.' + methods + '.png'
saveas(f, filenames);

Invalid filename.

Please fix this also.

[Voss]

mypath = "C:\chahar\"; % string (with double quotes)
methods = {'OLS', 'RF'};
dependent_vars = {'act_y_ha', 'act_per_ha'};
% string concatenation 
filenames = mypath + dependent_vars.' + methods + '.png';

for m = 1:length(methods)
    for jj = 1:numel(dependent_vars)
        % Save the figure
        saveas(f, filenames(jj,m));
   end      
end

[Voss]

Or, if you prefer:

mypath = 'C:\chahar\'; % character vector (with single quotes)
methods = {'OLS', 'RF'};
dependent_vars = {'act_y_ha', 'act_per_ha'};
for m = 1:length(methods)
    method = methods{m};
    for jj = 1:numel(dependent_vars)
        var = dependent_vars{jj};
        % Save the figure
        saveas(f, [mypath,method,var,'.png']); % character vector concatenation
    end      
end