Why isn't the program run?

clear all
clc;
syms x
f=sym(zeros(3,1));
g=sym(zeros(3,1));
h=sym(zeros(3,1));
f(1)=x;
f(2)=x^3;
f(3)=2;
g(1)=1;
g(2)=x;
g(3)=x^2;
h(1)=abs(x);
h(2)=sin(x);
h(3)=-abs(x);
ff = matlabFunction(f);
gf = matlabFunction(g);  
hf = matlabFunction(h);
x = 0:0.5:10;
fgh = [ff(x)' gf(x)' hf(x)'];
figure(1)
for i = 1:3
    subplot(3,1,i)   
    plot(x, fgh(:,i+[0 3 6]))
    grid on
    xlabel('x')
    title( sprintf('Plot of f_{%d}, g_{%d}, h_{%d}', [i i i]))
end

[Henric Rydén]

Reformat your code please

[Star Strider]

This seems to be exactly what you asked in ‘ How can i plot f(i),g(i),h(i) in one figure(i)? ’ with only the functions changing.

What did not work with that code in your changed functions?

[MA]

really i don't khnow,i only change functions and then didn't work

[MA]

i take screenshot from it's error

Answer 1

[Andrei Bobrov]

ff = @(x)[x(:),x(:).^3,repmat(2,numel(x),1)];
gf = @(x)[ones(numel(x),1),x(:),x(:).^2];
hf = @(x)[abs(x(:)),sin(x(:)),-abs(x(:))];

x = 0:0.5:10;
fgh = [ff(x) gf(x) hf(x)];
figure(1)
for i = 1:3
    subplot(3,1,i)   
    plot(x, fgh(:,i+[0 3 6]))
    grid on
    xlabel('x')
    title( sprintf('Plot of f_{%d}, g_{%d}, h_{%d}', [i i i]))
end

[MA]

if we just know that f(1),f(2),f(3)....h(3) exist and they are function of x variable we don't khnow their criterion,how do i supposed to do?

[Andrei Bobrov]

use interp1 or griddedInterpolant