Re: Column Product of a Matrix of zeros and 1's

• To: mathgroup at smc.vnet.net
• Subject: [mg88042] Re: Column Product of a Matrix of zeros and 1's
• From: P_ter <petervansummeren at gmail.com>
• Date: Wed, 23 Apr 2008 04:05:25 -0400 (EDT)

```Hello Bill,
thanks for your answer and sorry I am not clear. This is an example of myGlobalMatrix:
myM2 = {
{1, 1, 0, 0, 0, 0, 1, 0, 0},
{1, 1, 0, 0, 0, 0, 1, 1, 0},
{1, 1, 1, 0, 0, 0, 1, 1, 0},
{1, 0, 1, 0, 0, 0, 1, 1, 1},
{1, 1, 0, 1, 0, 1, 0, 0, 0},
{1, 1, 1, 1, 0, 1, 0, 0, 0},
{1, 0, 1, 1, 1, 0, 0, 0, 0},
{1, 0, 1, 1, 0, 1, 0, 0, 0}
};
I take the product of colomn 1 and 2 as an example:
{1,1,1,0,1,1,0,0} (thisSet= {1,2})
The positions of the 1's are: {1,2,3,5,6} (with Flatten)
I solved how to do this for thisSet etc. But I did not use the property that myGlobalMatrix (myM2)is 1's and 0's.

with friendly greetings,
P_ter

```

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