This code uses the "qt"
graphics toolkit only if available and defaults to using "gnuplot"
else:
gts = available_graphics_toolkits() qt_available = any(strcmp(gts, 'qt')) if qt_available graphics_toolkit("qt") else graphics_toolkit("gnuplot") endif
See Octave: Check if cell array of strings contains string for details on how to check if a string like "qt"
is in a cell array of strings like the one returned by available_graphics_toolkits()
.