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

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)))

[Stephan]

https://de.mathworks.com/help/symbolic/latex.html?s_tid=doc_ta#bu7szcu

[KieranSQ]

Many thanks for your comment, but this does not wokr for a function handle - is there anything that would do this job?

Answer 1

[aara]

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.

[KieranSQ]

Thank you for this - yes it works for this particular case. The issue now would be if there is a decimal present as a scaling.

[KieranSQ]

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,'./','/')

It is discussed on this question - https://uk.mathworks.com/matlabcentral/answers/356617-how-to-remove-a-some-part-of-a-string-from-a-string.

Many thanks for your help!