Making functions with 'inline' command in matlab

[nottern]

hi everybody... I'm new here, and I'm here 'cause I'm having some trouble with matlab
i was trying to integrate a function, so i first defined the function with the inline command:
f=inline('1/sqrt(1-0.25*sin(x)^2)')
now MATLAB says nothing if you write the function with this command, but it makes it after, when you decide to do some operation... that happens to me when i try to integrate using the quad command, and MATLAB throws those red letters saying Error...
i may be making some syntaxis mistakes, that's why I'm asking here for some help

by the way, i want to do this integral
$\int_0^{\frac{\pi}{2}} \frac{ds}{\sqrt{1-0.25\sin^2(s)}}$
thanks

 

[CEL]

hi everybody... I'm new here, and I'm here 'cause I'm having some trouble with matlab
i was trying to integrate a function, so i first defined the function with the inline command:
f=inline('1/sqrt(1-0.25*sin(x)^2)')
now MATLAB says nothing if you write the function with this command, but it makes it after, when you decide to do some operation... that happens to me when i try to integrate using the quad command, and MATLAB throws those red letters saying Error...
i may be making some syntaxis mistakes, that's why I'm asking here for some help

by the way, i want to do this integral
$\int_0^{\frac{\pi}{2}} \frac{ds}{\sqrt{1-0.25\sin^2(s)}}$
thanks

try
f=inline('1./sqrt(1-0.25*sin(x).^2)')

 

[tacman]

for your help

Hello! It seems like you are on the right track with using the inline command to define your function. However, the error you are getting when trying to integrate using the quad command is most likely due to the syntax of your function. In MATLAB, the quad command requires the function to be defined in the form of an anonymous function, which is slightly different from using the inline command.

To define an anonymous function in MATLAB, you can use the following syntax:
f = @(x) 1/sqrt(1-0.25*sin(x)^2)

This will create a function handle for your function and you can then use it with the quad command to perform the integration. So your final code would look something like this:

f = @(x) 1/sqrt(1-0.25*sin(x)^2);
integral = quad(f, 0, pi/2);

I hope this helps clarify the issue and allows you to successfully integrate your function. Happy coding!