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view toolboxes/FullBNT-1.0.7/bnt/examples/dynamic/HHMM/Mgram/letter2num.m @ 0:e9a9cd732c1e tip

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first hg version after svn
author wolffd
date Tue, 10 Feb 2015 15:05:51 +0000
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function n = letter2num(l)

% map a-z to 1:26 and A-Z to 27:52
punct_code = [32:47 58:64 91:96 123:126];
digits_code = 48:57;
upper_code = 65:90;
lower_code = 97:122;

c = double(l);
n = c-96;
ndx = find(n <= 0); % upper case
n(ndx) = c(ndx)  - 64 + 26;