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<div class="moz-cite-prefix">On 19/12/2012 11:17, Lamy Alain wrote:<br>
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cite="mid:8F232902ADB4E14EB16789FB7006FC841036C0@TW-MBX-P01.cnesnet.ad.cnes.fr"
type="cite">
<pre wrap="">Hi,
Does anyone know how to perform efficiently an operation like :
u .^k
with:
u = [u1, u2, ..., un] // ui : real numbers
and:
k = [k1; k2; kp] // ki : positive integers
The result being :
[ u1^k1, u2^k1, ..., un^k1;
u1^k2, u2^k2, ..., un^k2;
...
u1^kp, u2^kp, ..., un^kp ]
I know how to do it with cumprod (for instance), but it does not seem to be
efficient enough.
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<br>
Hi<br>
<br>
I'm not sure you can imagine something more efficient for the
general case (arbitrary k's) than:<br>
<br>
U = ones(1,n)*u;<br>
K = ones(1,n)*k;<br>
<br>
ans = U.^K;<br>
<br>
<br>
<br>
<br>
<br>
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cite="mid:8F232902ADB4E14EB16789FB7006FC841036C0@TW-MBX-P01.cnesnet.ad.cnes.fr"
type="cite">
<pre wrap="">
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