parametricplot in pstricks

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parametricplot in pstricks

Luis Sequeira-5
The problem is one of scale. Since cos expects degrees, and your t goes from -1.8 to 1.8,
your   this is practically a straight line.
I mean cos(0.25πt) when t is 1.8 degrees is approx 0.99969...

Bottom line, the output is correct.

You may try changing the interval, and also, for good measure, use different scales for x and y.

Try this for comparison:

\parametricplot[plotstyle=curve, plotpoints=50,yunit=0.05mm,xunit=1cm]{-360}{360}{0.25 t Pi mul mul cos t}

Luis Sequeira
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