The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Inactive » comp.soft-sys.math.mathematica

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Integrating a Matrix
Replies: 6   Last Post: Nov 29, 2013 3:48 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ] Topics: [ Previous | Next ]
Murray Eisenberg

Posts: 2,105
Registered: 12/6/04
Re: Integrating a Matrix
Posted: Nov 29, 2013 3:48 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

I forgot what the ref/NIntegrate explicitly shows, in the Examples >
Basic Examples section: that NIntegrate will apply directly to the
individual entries of a vector or matrix =97 or, presumably,
higher-order array. So now flattening at start, restructuring at end, is

It would be nice to have this automatic threading documented in some way
other than in two examples. But that sort of thing is a shortcoming of a
lot of the documentation.

On Nov 28, 2013, at 2:22 AM, Murray Eisenberg <> wrote:

> Perhaps something like the following (very simple example)?
> mat = Table[f[i, j][x], {i, 1, 3}, {j, 1, 3}]
> Partition[(NIntegrate[#, {x, 0, 1}] &) /@ Flatten[mat], 3]
> On Nov 27, 2013, at 1:24 AM, David Barnes <> wrote:

>> I have a 3X3 matrix of functions fij[x], for i,j = 1,2,3, and I want to NIntegrate all nine elements over 0<x<1 to get a matrix of constants. Is there an easy way to do this other that doing 9 individual NIntegration's?

> ---
> Murray Eisenberg
> Mathematics & Statistics Dept.
> Lederle Graduate Research Tower
> University of Massachusetts
> 710 North Pleasant Street
> Amherst, MA 01003-9305

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.