[scilab-Users] Seeking help in plotting a function in Scilab.

[Sumit Adhikari]

This is straight going to my facebook updates. Thanks for making my day :)


On Wed, Dec 7, 2011 at 6:21 PM, Adrien Vogt-Schilb <vogt at centre-cired.fr>wrote:

>  Dear Vikash
>
> Scilab talking.
>
> try to use plot3d(x,y,z), z being a matrix (as opposed to vector)
>
> you can build from this working example:
>
> x=(-10:0.13:10)';
> t=(0:0.13:20)';
> z=(sin((x*t') ./2).^2) ./ (x *x');
> p=x *x';
> clf, plot3d(x,t,z)
>
> note the difference between element-wise operations and matricial
> operations like x*t'
>
>
>
> On 07/12/2011 17:55, Vik@$h Dutt P at ndey wrote:
>
>  Dear Scilab,
>
> I am Vikash Pandey, an Indian and presently pursuing PhD research in
> Nonlinear and Quantum Optics at University of Malaya, Malaysia.
>
> I am a new user of Scilab but I really like this software which is
> available for free and almost behaves like a substitute to the expensive
> MatLab.
>
>  I will really appreciate if you can help me in overcoming a 3D plotting
> problem which I am facing in Scilab. I was trying to plot the curve *[{sin(x*t/2)}
> / x]^2 *following the below mentioned set of instructions.
>
>
>  -->x=(-10:0.013:10);
>
> -->t=(0:0.013:20);
>
> -->m=(x .*t) ./2;
>
> -->p=x .*x;
>
> -->z=sin(m) .*sin(m);
>
> -->v=z ./p;
>
> -->clf, param3d(x,t,v)
>
> I had obtained the graph (see attached please) but *what I got was a
> parametric 3D curve while I was expecting a plot of 3D surface.* Besides,
> I had also tried plotting the function using commands *fplot3d, plot3d
> and plot3d1 *but all of them ended up with errors. I have attached two
> pictures in this email. One of them is the parametric curve which I got and
> another is a 3D surface curve which I was expecting.
>
>  Can you please tell me where I am wrong ? How can I obtain the expected
> 3D surface plot for the given function ?
>
>  Please correct me if I am wrong.
>
>  I will be thankful to you if I get to hear something from you on this.
>
>  Thanks You!
>  --
>  *With Best Wishes...*
>
>  *Vikash Pandey*
>
>  *PhD Research Assistant,*
> *Dept. of Physics (Quantum and Laser Science Group),*
> *University of Malaya, Kuala Lumpur, *
> *50603, Malaysia*
>
>  *Mobile Number:  +91-898-759-9601  [India]*
> *                                         +60-010-785-6758 [Malaysia]*
> *e_mail: vikash4exploring at gmail.com*
> *Skype: vikash4exploring*
>
>
>
>
>
>
>
>
>
> --
> Adrien Vogt-Schilb (Cired)
> Tel: (+33) 1 43 94 *73 77*
>



-- 
Sumit Adhikari,
Institute of Computer Technology,
Faculty of Electrical Engineering,
Vienna University of Technology,
Gußhausstraße 27-29,1040 Vienna
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