<div class="gmail_quote"> <span>Dear Scilab,</span><div>
<br><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px">I am Vikash Pandey, an Indian and presently pursuing PhD research in Nonlinear and Quantum Optics at University of Malaya, Malaysia.</div>
<div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px"> </div><div><font color="#222222" face="arial, sans-serif">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. </font></div>
<div><font color="#222222" face="arial, sans-serif"><br></font></div><div><font color="#222222" face="arial, sans-serif">I will really appreciate if you can help me in overcoming a 3D plotting problem which I am facing in Scilab. </font><span style="font-family:arial,sans-serif;font-size:13px"><font color="#222222">I was trying to plot the curve </font><b><font color="#000099">[{sin(x*t/2)} / x]^2 </font></b><font color="#222222">following the below mentioned set of instructions.</font></span></div>
<div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px"><br></div><div><div><font color="#222222" face="arial, sans-serif"><br></font></div><div><font color="#663366"><font face="arial, sans-serif">-</font><font face="arial, sans-serif">->x=(-10:0.013:10);</font></font></div>
<div><font face="arial, sans-serif" color="#663366"> </font></div><div><font face="arial, sans-serif" color="#663366">-->t=(0:0.013:20);</font></div><div><font face="arial, sans-serif" color="#663366"> </font></div>
<div><font face="arial, sans-serif" color="#663366">-->m=(x .*t) ./2;</font></div><div><font face="arial, sans-serif" color="#663366"> </font></div><div><font face="arial, sans-serif" color="#663366">-->p=x .*x;</font></div>
<div><font face="arial, sans-serif" color="#663366"> </font></div><div><font face="arial, sans-serif" color="#663366">-->z=sin(m) .*sin(m);</font></div><div><font face="arial, sans-serif" color="#663366"> </font></div>
<div><font face="arial, sans-serif" color="#663366">-->v=z ./p;</font></div><div><font face="arial, sans-serif" color="#663366"> </font></div><div><font face="arial, sans-serif" color="#663366">-->clf, param3d(x,t,v)</font></div>
</div></div><div><br clear="all"><div>I had obtained the graph (see attached please) but <b>what I got was a parametric 3D curve while I was expecting a plot of 3D surface.</b> Besides, I had also tried plotting the function using commands <b>fplot3d, plot3d and plot3d1 </b>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.</div>
<div><br></div><div>Can you please tell me where I am wrong ? How can I obtain the expected 3D surface plot for the given function ? </div><div><div>
<br></div><div>Please correct me if I am wrong.</div><div>
<br></div><div>I will be thankful to you if I get to hear something from you on this.</div>
<div><br></div><div>
Thanks You!</div></div>-- <br><div><font color="#3333ff" face="georgia, serif"><span style="color:rgb(0,0,0);font-family:arial"><div><font face="georgia,serif"><font color="#3333ff"><b>With Best Wishes...</b></font></font></div>
<div><font color="#6633ff" face="georgia,serif"><font color="#3366ff"><br></font></font></div><div><b><font face="georgia, serif" size="4">Vikash Pandey</font></b></div><div><span style="color:rgb(51,102,255);font-family:georgia,serif"><br>
</span></div><div><font face="georgia, serif" color="#3333ff"><b>PhD Research Assistant,</b></font></div><div><font face="georgia, serif" color="#3333ff"><b>Dept. of Physics (Quantum and Laser Science Group),</b></font></div>
<div><b><font face="georgia, serif" color="#3333ff">University of Malaya, </font><span style="color:rgb(51,51,255);font-family:georgia,serif;background-color:rgb(255,255,255)">Kuala Lumpur, </span></b></div><div><span style="background-color:rgb(255,255,255)"><font face="georgia, serif" color="#3333ff"><b>50603, Malaysia</b></font></span></div>
<div><span style="color:rgb(51,102,255);font-family:georgia,serif"><span style="color:rgb(68,79,117);font-family:arial,helvetica,sans-serif;background-color:rgb(255,255,255)"><br></span></span></div><div><font face="georgia,serif"><b><font color="#33cc00">Mobile Number: </font><font color="#3333ff"> </font><font color="#999999"><a href="tel:%2B91-898-759-9601" value="+918987599601" target="_blank">+91-898-759-9601</a> [India]</font></b></font></div>
<div><font face="georgia, serif"><b><font color="#3333ff"> +</font><span style="background-color:rgb(255,255,255)"><font color="#3333ff">60-010-785-6758</font><font color="#33cc00"> </font><font color="#33ff33">[</font><font color="#3333ff">Malaysia</font><font color="#33ff33">]</font></span></b></font></div>
<div><b><span style="font-family:arial,helvetica,sans-serif;background-color:rgb(255,255,255)"><font color="#33cc00">e_mail:</font></span><span style="color:rgb(51,102,255);font-family:arial,helvetica,sans-serif;background-color:rgb(255,255,255)"> </span><span style="font-family:arial,helvetica,sans-serif;background-color:rgb(255,255,255)"><font color="#3333ff"><a href="mailto:vikash4exploring@gmail.com" target="_blank">vikash4exploring@gmail.com</a></font></span></b></div>
<div><b><font face="arial, helvetica, sans-serif" color="#33cc00">Skype:</font><font face="arial, helvetica, sans-serif" color="#3333ff"> vikash4exploring</font></b></div><div><font face="arial, helvetica, sans-serif" color="#3333ff"><br>
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