Re: plot and graphs

[Mahvish Nazir]

On Mon, Sep 3, 2012 at 1:14 PM, James Sherman Jr. <address@hidden> wrote:

On Mon, Sep 3, 2012 at 7:59 AM, Mahvish Nazir <address@hidden> wrote:

On Mon, Sep 3, 2012 at 12:38 PM, Andy Buckle <address@hidden> wrote:

On 3 September 2012 12:09, Mahvish Nazir <address@hidden> wrote:
> Can we plot the integrals using octave. I know we can plot functions but can
> we plot the integral of the function? please help

Why not?

>x=0:.1:1;
>y=x;
>plot(x,y)
>hold on
>q=cumtrapz(x,y);
>plot(x,q)
>plot(x,x^2/2,'x')


--
/* andy buckle */

Thanks Andy!

What if we have a function say (cos(t^2))^2*exp(i*t) and we want to plot its integral over the limits -5 to 5? how do we do that?

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I'm not sure what you mean here.  Do you want to evaluate the integral from -5 to 5 of that function?  If so, you can just take the same steps that Andy did with the numerical estimation of the integral.  I'm not sure what you want to plot here.

James Sherman

@Doug:  i is the complex number, sqrt(-1)

 

@James: I want to plot the integral of my function. I am not sure where to write my function in the steps suggested by Andy. That might sound stupid, but i am really bad at it