this programme in matlab 2017b but icant run it

syms x;
syms E;
syms a;

p(x) =(sqrt(2*(E-potential(x,a))))
q  =  integral(p(x),0,x)

function [v] = potential(a,x)
v= a.*x
end

[Rik]

Today I formatted your code. Next time, you can do it yourself by selecting your code and pushing the {}Code button.

[Rik]

What is the error you are getting? You can run scripts that contain functions since R2016b, so that isn't the problem. I don't have the symbolic toolbox, so I can't check the code itself for you.

Answer 1

[Tiasa Ghosh]

For using Integral (), you must describe 'p' as a function handle with the '@' notation.Like this:

p = @(x) sqrt(2*(E-potential(x,a)));

This will work for Integral(). However, your second input to integral is 'x' which a symbolic variable. But Integral() accepts only scalar values as input. You need to change that.

[Rik]

Maybe OP meant to use the int function. I can't find in the doc if it supports multiple variables, so maybe you'll have to nest two calls to int.

p =(sqrt(2*(E-potential(x,a))))
q  =  int(p,E,0,x)

[Aalaa Abu alrob]

Thanks for your attention .. but my integral is with respect to x.. and other sympoles are constant

[Walter Roberson]

Your a is not constant, it is an unresolved symbolic variable.

Answer 2

[Walter Roberson]

p is defined in terms of the symbolic variable a. integral() is for numeric integration and cannot be used with unresolved symbolic variables.

Please recheck the order of parameters for your function. You define the function with one order but you call it with a different order.