sftab2ch.m

数字通信第四版原书的例程

function sftab2chk(xindex,yindex,table);
%SFTAB2CHK Checks input to SFTABLE2 for correctness.
%	SFTAB2CHK(XINDEX,YINDEX,TABLE) makes sure that all of the arguments
%	to SFTABLE2 are appropriate.

%	Copyright (c) 1990-94 by The MathWorks, Inc.
%	Ned Gulley
%	3-9-92

xlen = length(xindex);
ylen = length(yindex);
[m,n] = size(table);
if m ~= xlen,
    error('XINDEX must have the same number of elements as TABLE has rows');
end;
if n ~= ylen,
    error('YINDEX must have the same number of elements as TABLE has columns');
end;

if any(diff(xindex) <= 0),
    error('XINDEX must increase monotonically');
end;
if any(diff(yindex) <= 0),
    error('YINDEX must increase monotonically');
end;