# How do you print an anonymous function properly in a figure title?

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KieranSQ on 11 Feb 2019
Commented: KieranSQ on 11 Feb 2019
I am trying to print an anonymous function as part of a title for a plot. I would like it to look like a latex entry where but we get f(x)=@(x)x.^2 instead.
I have provided a MWE below;
f=@(x) x.^2
x_coordinates=[1:10]
fx=f(x_coordinates)
plot(x_coordinates,fx)
title(sprintf('The Evolution of the Heat Equation with Source f(x)=%s', func2str(f))) ##### 2 CommentsShowHide 1 older comment
KieranSQ on 11 Feb 2019
Many thanks for your comment, but this does not wokr for a function handle - is there anything that would do this job?

aara on 11 Feb 2019
You could do it by manipulating the equation of the function alone and then adding it to the remaining text:
f=@(x) x.^2
x_coordinates=[1:10]
fx=f(x_coordinates)
plot(x_coordinates,fx)
eqn = func2str(f);%changes to a char array
eqn2 = eqn(5:end);%removes the '@(x) handle
eqn3 = replace(eqn2,'.','') %removes the . used for multiplication
placeholder1 = "The Evolution of the Heat Equation with Source \$f(x)=" + string(eqn3+ "\$")
title(placeholder1,'Interpreter','latex')
Not sure if this works for all equations.
##### 2 CommentsShowHide 1 older comment
KieranSQ on 11 Feb 2019
I have now found a way to remove certain parts of the string without losing others - we would use something like this,
eqn = func2str(fu);%changes to a char array
eqn2 = eqn(5:end);%removes the '@(x) handle
eqn2=strrep(eqn2,'.*','')
eqn3=strrep(eqn2,'.^','^')
eqn3=strrep(eqn2,'./','/')