how to know the array of the function that i plot

hi everyone,

i need some a little help to complete my project, it is not hard but when i make the user enter a function in GUI and plot it alone it works but when i try to multiply it with another function it doesnt work.

also how i can know how to find the array that the matlab calculated for my function

thank for you all

[Ameer Hamza]

How are you trying to multiply the functions? You cannot multiply function handles in MATLAB, so you need to call the function with input arguments to multiply.

[Momen Odeh]

I mean with function f(x) not the matlab function

[Ameer Hamza]

But how are you converting the string entered in GUI to a function and then multiply them?

[Momen Odeh]

The string will be the function y, 'eval(y)' , it will be an array so i used arrays element multiplication

Answer 1

[Ameer Hamza]

See this example to convert to strings to function handles and multiply them

y1 = 'sin(x)';
y2 = 'cos(x)';

y1f = str2func(['@(x) ' y1]);
y2f = str2func(['@(x) ' y2]);

y = @(x) y1f(x).*y2f(x);

Answer 2

[Image Analyst]

Make sure you use .* instead of just * alone:

vec1 = function1();
vec2 = function2();
theProduct = vec1 .* vec2;

[Momen Odeh]

I did