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plvasp - Specify viewport using aspect ratio only
Sets the viewport so that the ratio of the length of the y axis to that of the x axis is equal to aspect. Redacted form: plvasp(aspect) This function is used in example 13.
aspect (PLFLT, input) Ratio of length of y axis to length of x axis.
Many developers (who are credited at http://plplot.sourceforge.net/credits.php) have contributed to PLplot over its long history.
PLplot documentation at http://plplot.sourceforge.net/documentation.php. February, 2016 PLVASP(3plplot)