Time xdata plot

[Michael Hindley]

What is the structure of a string array for a time function plot ?
Here is my test program which does not run
 
a=['20030101'
   '20030102'
   '20030103'];
b=[1 2 3];
gset xdata time
gset timefmt "%Y%m%d" 
plot(a,b);

The error's

error: mapper: wrong type argument `string'
error: evaluating argument list element number 1
error: evaluating index expression near line 40, column 12
error: evaluating argument list element number 1
error: evaluating index expression near line 40, column 7
error: if: error evaluating conditional expression
error: evaluating if command near line 40, column 3
error: called from `__plt2__' in file
`/usr/share/octave/2.1.36/m/plot/__plt2__.m'
error: called from `__plt__' in file
`/usr/share/octave/2.1.36/m/plot/__plt__.m'
error: called from `plot' in file
`/usr/share/octave/2.1.36/m/plot/plot.m'
error: near line 7 of file
`/home/makke/stock_market/octave_devel/develop/test.m'

regards
Michael Hindley



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