How can I convert a equation into an character array?

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Hi community,
I want to convert an equation like: N=1-X into an character array like: Z='N=1-X' or the other way around. The problem is functions like string2num() do not accept variables as input.
  4 Comments
Guillaume
Guillaume on 19 Oct 2018
Again, as Matt asked, what form does the equation takes in your code? There are many ways to code an equation for plotting and the answer is going to depend on how you've done it.
Emre Sahin
Emre Sahin on 19 Oct 2018
Edited: Emre Sahin on 20 Oct 2018
I don't exactly know what you mean, I will just show an example code:
classdef Formfunctions < handle
methods(Static)
function surfplot(handles,X,Y,N)
s=surf(X,Y,N);
s.FaceColor='interp';
a=gca;
a.Box='on';
zlim([0 1]);
xlabel('x')
ylabel('y')
% I want to display the function instead of N %
zlabel('N')
% I want to show the function N on the static text field%
set(handles.text,'string', N)
end
function Node1plot(handles,X,Y)
%Nr.1%
N1=1/4*(1-X).*(1-Y);
figure('Name','Plot Formfunctions: Node1plot',...
'NumberTitle','off', 'Units', 'Normalized', ...
'OuterPosition', [0.5 0 0.5 1]);
colormap(jet)
Formfunctions.surfplot(handles,X,Y,N1)
end
function Node2plot(handles,X,Y)
%Nr.2%
N2=1/4*(1+X).*(1-Y);
figure('Name','Plot Formfunction: Node2plot',...
'NumberTitle','off', 'Units', 'Normalized', ...
'OuterPosition', [0.5 0 0.5 1]);
colormap(jet)
Formfunctions.surfplot(handles,X,Y,N2)
end
end
end
In the main function I will just have the comands:
if(blabla==bla)
Formfunctions.Node1plot(handles,X,Y);
elseif(blabla==blala)
Formfunctions.Node2plot(handles,X,Y);
end
I hope that it is know clear.

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Accepted Answer

Matt J
Matt J on 19 Oct 2018
Edited: Matt J on 19 Oct 2018
    methods(Static)  
        function surfplot(handles,X,Y,fun)  %<---change
            s=surf(X,Y,fun(X,Y));
            s.FaceColor='interp';
            a=gca;
            a.Box='on';
            zlim([0 1]);
            xlabel('x')
            ylabel('y')
            % I want to display the function instead of N %
            N=strrep( func2str(fun) ,'@(x,y)','' );  %<---change
            zlabel( N )
            % I want to show the function N on the static text field%
            set(handles.text,'string', N)
        end
        function Node1plot(handles,X,Y)  
            fun=@(x,y) 1/4*(1-x).*(1-y);  %<---change
            figure('Name','Plot Formfunctions: Node1plot',...
                   'NumberTitle','off', 'Units', 'Normalized', ...
                   'OuterPosition', [0.5 0 0.5 1]);
            colormap(jet)
            Formfunktionen.surfplot(handles,X,Y,fun)  %<---change
        end
     end

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