[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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