Re: How to deal with big matrix?

*To*: mathgroup at smc.vnet.net*Subject*: [mg116636] Re: How to deal with big matrix?*From*: Ray Koopman <koopman at sfu.ca>*Date*: Tue, 22 Feb 2011 04:44:10 -0500 (EST)*References*: <ijv26p$73d$1@smc.vnet.net>

On Feb 21, 5:06 pm, Szymon Roziewski <szymon.roziew... at gmail.com> wrote: > Hello there, > > I have quite big matrix with let say 1000 rows and 1100 columns. > Each of element of this matrix is a point on a surface e.g. {1.232,12.123} > How can I quickly get first element of each point for whole matrix and put > it in a vector (1000*1100 - this will be a length of that vector) without do > it in a nested loop (Do[Do[...]])? > And the similar to get the second element of each point into vector. > > kind regards, > Szymon Roziewski xy = {{{x11,y11},{x12,y12},{x13,y13},{x14,y14}}, {{x21,y21},{x22,y22},{x23,y23},{x24,y24}}, {{x31,y31},{x12,y32},{x33,y33},{x34,y34}}}; {x,y} = Flatten /@ Transpose[xy,{2,3,1}] {{x11, x12, x13, x14, x21, x22, x23, x24, x31, x12, x33, x34}, {y11, y12, y13, y14, y21, y22, y23, y24, y31, y32, y33, y34}}