Re: Part Function
- To: mathgroup at smc.vnet.net
- Subject: [mg132259] Re: Part Function
- From: Alexei Boulbitch <Alexei.Boulbitch at iee.lu>
- Date: Fri, 24 Jan 2014 04:21:38 -0500 (EST)
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I have a Mathematica script containing the following line:
v[k_] := SetAccuracy(2*(Part[Q1[[k]],1]),45]
where Q1 is a 96 x 96 matrix.
Is Part[Q1[[k]],1] the same as Q1[k,1]? If not, what is it returning?
Any help appreciated.
Hi, Fred,
It is easy to see what is it by generating a simple example. Let us define a small matrix
as follows:
Q[k_] := {{k + 1, k - 1}, {k^2, 1/k}}
You can have a look at it. Evaluate this:
Q[k] // MatrixForm.
Now the expression you are asking about is:
Part[Q[k], 1]
Evaluate it! The result is below:
{1 + k, -1 + k}
Thus, it returns the first line of the matrix.
Have fun, Alexei
Alexei BOULBITCH, Dr., habil.
IEE S.A.
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