Problem with With
- To: mathgroup at smc.vnet.net
- Subject: [mg80630] Problem with With
- From: Miguel <misvrne at gmail.com>
- Date: Sun, 26 Aug 2007 23:26:37 -0400 (EDT)
Let the matrix M={{Cos[alfa], -Sin[alfa], 0},{Sin[alfa], Cos[alfa], 0}, {0, 0, 1}}. In[]: With[{alfa=45=BA}, M] Out[]: Out[]: {{Cos[alfa], -Sin[alfa], 0},{Sin[alfa], Cos[alfa], 0}, {0, 0, 1}} Mathematica does'nt evaluate the matrix. But In[]: {{Cos[alfa], -Sin[alfa], 0},{Sin[alfa], Cos[alfa], 0}, {0, 0, 1}}/.alfa->45=BA works fine. Any idea?