how to apply Position repeatedly without a loop?
- To: mathgroup at smc.vnet.net
- Subject: [mg118634] how to apply Position repeatedly without a loop?
- From: steveh44 <steve_h44 at yahoo.com>
- Date: Thu, 5 May 2011 05:24:01 -0400 (EDT)
i have matrix A and wanted to find the Positions in this matrix of
some elements which listed in some another vector.
how to use Position to do it without a loop?
I tried this:
In[192]:= A={{1,2,3},
{3,4,5},
{6,7,8}};
elements={3,6};
Position[A,r[[1]]]
Out[194]= {{1,1}}
Position[A,r[[2]]]
Out[197]= {{1,2}}
but I want to do something like
Position[A,r]
but this does not work.
I tried Map, Thread, etc.. but could not get it to work. not sure what
the syntax is.
thanks for help
steve