fwhm This function computes peak full width at half minimum or at another level of peak minimum for vector or matrix data y supplied as input. f = fwhm (y) f = fwhm (x, y) f = fwhm (…, "zero") f = fwhm (…, "min") f = fwhm (…, "alevel", level) f = fwhm (…, "rlevel", level) y: vector or matrix