Re: setting elements of an array based on a condition

*To*: mathgroup at smc.vnet.net*Subject*: [mg87158] Re: setting elements of an array based on a condition*From*: Szabolcs Horvát <szhorvat at gmail.com>*Date*: Wed, 2 Apr 2008 05:57:49 -0500 (EST)*Organization*: University of Bergen*References*: <fsvejr$ssp$1@smc.vnet.net>

Claus wrote: > Hello, > I have one array, W, which for testing purposes has 25 rows and 50 columns. > There are two more things I want to accomplish with this: > 1) I want to set all elements of W which are smaller than zero to zero. Clip[W, {0, Infinity}] > 2) Then I want to calculate the sum of the elements in each column of W. > How can I do this? Plus @@@ W or Total /@ W