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plscol0a - Set 8-bit RGB values and double alpha transparency value for given cmap0 color index
plscol0a(icol0, r, g, b, alpha)
Set 8-bit RGB value and double alpha transparency value for given cmap0 (see the PLplot documentation) index. Overwrites the previous color value for the given index and, thus, does not result in any additional allocation of space for colors. This function is used in example 30.
icol0 (PLINT, input) Color index. Must be less than the maximum number of colors (which is set by default, by plscmap0n(3plplot), or even by plscmap0(3plplot)). r (PLINT, input) Unsigned 8-bit integer (0-255) representing the degree of red in the color. g (PLINT, input) Unsigned 8-bit integer (0-255) representing the degree of green in the color. b (PLINT, input) Unsigned 8-bit integer (0-255) representing the degree of blue in the color. alpha (PLFLT, input) double value (0.0-1.0) representing the alpha transparency value of the color.
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 PLSCOL0A(3plplot)