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Adding arrays of different dimensions [message #56431]

Fri, 19 October 2007 09:46

ianpaul.freeley
Messages: 18
Registered: March 2007

Junior Member

I keep running into this and not being sure what the best solution is.

I have a 2d array, and I'd like to add a 1d array to each row (or
column).
The easy stupid slow way:
a=findgen(3,5)
b=[1,2,3]
for i=0,4 do a[*,i]=a[*,i]+b

Perhaps a better way with no loops:
a=findgen(3,5)
b=[1,2,3]
x=b#(fltarr(n_elements(a[0,*])) +1)
a=a+x

Is there a better way? Anyone care to generalize so I can optimally
add 2d arrays into 3d?

Thanks,
IP Freeley

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