RecurrenceTable warning
- To: mathgroup at smc.vnet.net
- Subject: [mg102430] RecurrenceTable warning
- From: green tea <cetech07 at gmail.com>
- Date: Sun, 9 Aug 2009 06:05:11 -0400 (EDT)
Hello, I'm using Mathematica 7.0.1.
This example is in documentation center.
In[1]:= RecurrenceTable[{a[n + 1] == 3 a[n], a[1] == 7}, a, {n, 1, 5}]
Out[1]= {7, 21, 63, 189, 567}
I added a[n]==b[n].
In[2]:= RecurrenceTable[{b[n] == a[n], a[n + 1] == 3 a[n],
a[1] == 7}, {a, b}, {n, 1, 5}]
Out[2]= {{7, 7}, {21, 21}, {63, 63}, {189, 189}, {567, 567}}
it works well.
but when I simply swapped a with b, a warning occured.
In[3]:= RecurrenceTable[{a[n] == b[n], b[n + 1] == 3 b[n],
b[1] == 7}, {b, a}, {n, 1, 5}]
During evaluation of In[3]:= Inverse::matsq: Argument {{1/4,1,-1},
{1/4,0,1}} at position 1 is not a non-empty square matrix. >>
Out[3]= {{7, 7}, {21, 21}, {63, 63}, {189, 189}, {567, 567}}
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