[LON-CAPA-users] Piecewise Linear Functions

Justin Gray jgray at math.sfu.ca
Sat Mar 21 15:33:43 EDT 2020

Hi Gene,

To answer your first question, here is a sample piecewise-defined function
in Gnuplots:

<gnuplot width="400" solid="0" plotcolor="monochrome" gridlayer="off"
bmargin="default" font="9" alttag="dynamically generated plot"
bgcolor="xffffff" texfont="22" transparent="off" plottype="Cartesian"
rmargin="default" gridtype="Cartesian" minor_ticscale="0.5"
fontface="sans-serif" grid="on" align="middle" texwidth="93" height="300"
border="on" samples="1000" fgcolor="x000000" major_ticscale="1"
tmargin="default" lmargin="default" fillstyle="empty">
    <axis yzero="off" xformat="on" xmin="-10.0" yformat="on"
color="x000000" ymax="10.0" ymin="-10.0" xmax="10.0" xzero="off" />
         pointsize="1" >
        <function>x < 0 ? -x : x**2</function>



*Justin Gray*
Senior Lecturer | Department of Mathematics
Simon Fraser University | SCK 10531
8888 University Dr., Burnaby, B.C. V5A 1S6
T: 778.782.4237
Simon Fraser University is located on the Unceded Coast Salish Territories
of the xʷməθkʷəy̓əm (Musqueam), Səl̓ílwətaʔ/Selilwitulh (Tsleil-Waututh),
Kwikwitlem, and Skwxwú7mesh Úxwumixw (Squamish) Peoples

On Sat, Mar 21, 2020 at 11:36 AM Harding, Gene L <glhardin at purdue.edu>

> Hi,
> Does anyone know how to define a piecewise linear function in LON-CAPA,
> and plot it with gnuplot? And, a related question: How  do you put plots
> next to each other?
> I need to display a plot of voltage on one graph, with a plot of
> phase-angle-fired half-sine current right below it on a separate graph, but
> using the same horizontal axis values and scale. The multiplot command in
> gnuplot allows multiple plots next to each other, similar to MATLAB, and
> the ternary operator allows definition of piecewise linear functions, but I
> don’t know how to implement either of them from within LON-CAPA.
> Best regards,
> Gene L. Harding, PE
> Associate Professor of ECET
> Purdue University
> 574-520-4190
> https://polytechnic.purdue.edu/south-bend/
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