Memory Leaks In Matrix Summation

*To*: mathgroup at smc.vnet.net*Subject*: [mg5822] Memory Leaks In Matrix Summation*From*: rmj at leland.Stanford.EDU (Roger M. Jones)*Date*: Wed, 22 Jan 1997 00:44:21 -0500*Organization*: Stanford University, CA 94305, USA*Sender*: owner-wri-mathgroup at wolfram.com

In summing a matrix I write over previous values in a do loop. However, as the resulting sample shows, the memory continues to grow (as it is in a loop it should, of course, write over itself). Is this a bug, and if so is there some means of avoiding it? In[1]:= xx=Array[Random[]+I Random[],{41,206}]; In[2]:= (* 206 x 206 Matrix of zeros *) res0=Table[0,{i,1,206},{j,1,206}]; In[3]:= (* Generate Matrix 206 x 206 ten times & sum over loop *) Do[ xxk=xx[[k]]; Print["#: ",k]; res=Re[Outer[Times,Conjugate[#],#]&[xxk]]; res0=res0+res; Print["Mem: ",N[MaxMemoryUsed[]/10^6]], {k,1,10}] #: 1 Mem: 10.9363 #: 2 Mem: 13.3135 #: 3 Mem: 14.332 #: 4 Mem: 15.5276 #: 5 Mem: 17.7384 #: 6 Mem: 19.9492 #: 7 Mem: 22.16 #: 8 Mem: 24.3708 #: 9 Mem: 26.5816 #: 10 Mem: 28.7924 Many thanks, Roger Jones -- Regards, Roger Jones (rmj at leland.stanford.edu)