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

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KieranSQ
KieranSQ 2019-2-11
评论： KieranSQ 2019-2-11
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)))

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aara
aara 2019-2-11
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 个评论
KieranSQ
KieranSQ 2019-2-11
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
KieranSQ 2019-2-11
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!

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