The error you're encountering, "Arrays have incompatible sizes for this operation," suggests that the comparison operation == between the string 'act_per_ha' and the cell array element dependent_vars{jj} is causing an issue due to incompatible sizes or types.
To fix this error, you can use the strcmp function to compare strings in MATLAB. Here's the corrected code:
if strcmp(dependent_vars{jj}, 'act_y_ha')
par = 'act\_y\_ha';
end
if strcmp(dependent_vars{jj}, 'act_per_ha')
par = 'act\_per\_ha';
end
