[LON-CAPA-users] Polar Format gnuplots

Harding, Gene L glhardin at purdue.edu
Fri May 1 19:38:58 EDT 2020


Hi Angela,

Thank you for sending that. If you use angular/radial coordinates, do you know if there is a way to label the angles around the circular perimeter? I figured out how to turn off the Cartesian grid, but need to display angles from 0-360 or -180 to +180 around the circle instead of x-y coordinates.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

From: LON-CAPA-users <lon-capa-users-bounces at mail.lon-capa.org> On Behalf Of Athanas, Angela
Sent: Friday, May 1, 2020 7:28 PM
To: Discussion list for LON-CAPA users <lon-capa-users at mail.lon-capa.org>
Subject: [LON-CAPA-users] {Disarmed} Re: Polar Format gnuplots

I have a couple of polar area problems. Here's one:

<problem>
    <script type="loncapa/perl">
$a=&random(5,10,1); $a1=&random(1,3,1);  $b=$a-1;
for ($x = 0; $x<=2*3.141592654; $x+= 0.01) {
     push @X1, ($a+$b*sin($x))*cos($x);
     push @Y1, ($a+$b*sin($x))*sin($x);
     push @X2, ($a+$b*sin($x))*cos($x);     push @Y2, 0;
     push @X3, 0; push @Y3, ($a+$b*sin($x))*sin($x); }
$area=$a**2/2+$b**2/4;
$area1="$area*$pi";
 </script>
 <startouttext />
<br />
Determine the area of the right half of the cardioid formed by <m eval="on">\[  r = $a + $b \sin{\theta} \, \] </m> <p />

<endouttext />
<gnuplot width="400" grid="off" align="center" font="medium" height="300" border="on" alttag="dynamically generated plot" bgcolor="xffffff" fgcolor="x000000" transparent="off">
     <curve linestyle="lines" name="" color="x8B0000" pointtype="1" pointsize="1">
         <data>@X1</data>
         <data>@Y1</data>
     </curve>
    <curve linestyle="lines" name="" color="x000000" pointtype="1" pointsize="2">
         <data>@X2</data>
         <data>@Y2</data>
     </curve>
    <curve linestyle="lines" name="" color="x000000" pointtype="1" pointsize="2">
         <data>@X3</data>
         <data>@Y3</data>
     </curve>
  </gnuplot>
<p />
<startouttext />Area of cardioid right half is <endouttext />
<formularesponse answer="$area1" samples="x,pi at 3,$pi:9,$pi#4" id="11">
<responseparam name="tol" default="0.001" description="Numerical Tolerance" type="tolerance" />
        <textline size="35" readonly="no" />
    </formularesponse>
</problem>


________________________________
From: LON-CAPA-users <lon-capa-users-bounces at mail.lon-capa.org<mailto:lon-capa-users-bounces at mail.lon-capa.org>> on behalf of Harding, Gene L <glhardin at purdue.edu<mailto:glhardin at purdue.edu>>
Sent: Friday, May 1, 2020 6:03 PM
To: Discussion list for LON-CAPA users <lon-capa-users at mail.lon-capa.org<mailto:lon-capa-users at mail.lon-capa.org>>
Subject: [LON-CAPA-users] Polar Format gnuplots


Hi,



Has anyone done polar-format gnuplots in LON-CAPA? Would you be willing to share an example? This is my first foray into polar gnuplots. I am having trouble getting the angle to display around the perimeter. It's rendering x- and y-axis values instead of angle and radius values.



Best regards,



Gene L. Harding, PE

Associate Professor of ECET

Purdue University

574-520-4190

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