Mercurial > octave-nkf
view scripts/general/logspace.m @ 4:b4df021f796c
[project @ 1993-08-08 01:26:08 by jwe]
Initial revision
author | jwe |
---|---|
date | Sun, 08 Aug 1993 01:26:08 +0000 |
parents | |
children | 16a24e76d6e0 |
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function retval = logspace (x1, x2, n) # usage: logspace (x1, x2, n) # # Return a vector of n logarithmically equally spaced points between # x1 and x2 inclusive. # # If the final argument is omitted, n = 50 is assumed. # # All three arguments must be scalars. # # Note that if if x2 is pi, the points are between 10^x1 and pi, NOT # 10^x1 and 10^pi. # # Yes, this is pretty stupid, because you could achieve the same # result with logspace (x1, log10 (pi)), but Matlab does this, and # claims that is useful for signal processing applications. # # See also: linspace if (nargin == 2) npoints = 50; elseif (nargin == 3) if (length (n) == 1) npoints = n; else error ("logspace: arguments must be scalars"); endif else error ("usage: logspace (x1, x2 [, n])"); endif if (npoints < 2) error ("logspace: npoints must be greater than 2"); endif if (length (x1) == 1 && length (x2) == 1) x2_tmp = x2; if (x2 == pi) x2_tmp = log10 (pi); endif retval = linspace (x1, x2_tmp, npoints); for i = 1:npoints retval(i) = 10 ^ retval(i); endfor else error ("logspace: arguments must be scalars"); endif endfunction