经典的DSP的C程序和汇编程序库
            LATEST DATE: 06/30/92 */
            /* CREATES THE XY PLOT FILE "NAME.DAT" FOR SUBSEQUENT PLOTTING. */
            /* INPUTS: X0 = STARTING ABSCISSA VALUE, X(0) */
            /* DX = X INCREMENT, X(K)-X(K-1) */
            /* Y(0:N-1,NP) = ORDINATE VALUES Y(0) THRU Y(N-1) FOR NP CURVES. */
            /* N = NUMBER OF (X,Y) POINTS ON EACH CURVE. */
            /* NP = NUMBER OF SEPARATE CURVES, FROM 1 THRU 6. */
            /* NAME = NAME OF FILE -- 6 CHARACTERS. */
            /* THE KTH RECORD OF THE "NAME.DAT" FILE HAS FORMAT (NP+1)2E15.7,
            AND */
            /* CONTENTS X(K),Y(K,1),Y(K,2),...,Y(K,NP). THUS, WITH NP=1, THE
            FILE */
            /* HAS JUST ONE (X,Y) PAIR PER RECORD