# how to know the array of the function that i plot

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Momen Odeh on 25 May 2020
Edited: Ameer Hamza on 25 May 2020
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

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Momen Odeh on 25 May 2020
I mean with function f(x) not the matlab function
Ameer Hamza on 25 May 2020
But how are you converting the string entered in GUI to a function and then multiply them?
Momen Odeh on 25 May 2020
The string will be the function y, 'eval(y)' , it will be an array so i used arrays element multiplication

Ameer Hamza on 25 May 2020
Edited: Ameer Hamza on 25 May 2020
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);

Image Analyst on 25 May 2020
Make sure you use .* instead of just * alone:
vec1 = function1();
vec2 = function2();
theProduct = vec1 .* vec2;

#### 1 Comment

Momen Odeh on 25 May 2020
I did