Adding a value to the cell of a matrix

*To*: mathgroup at smc.vnet.net*Subject*: [mg75880] Adding a value to the cell of a matrix*From*: newbie <puretexan at gmail.com>*Date*: Sat, 12 May 2007 03:15:03 -0400 (EDT)

I have a matrix of values that i am searching for a specific value in and i want to count the number of occurances in each column. which i can do but not in a loop. I want to be able to use a matrix to store the number of occurances so i can put it in a loop. I already have a loop that finds the values and just adds them to a value i created. do you know how i can add +1 to the cell of a matrix? When i try to do this it says the values are protected. i tried unprotecting them but couldn't get that to work. any ideas? Here is the code i am using for the search In[673]:=Orderedcellcycle=OverExpressed; (* Dimensions {200, 18}*) l=matrix1; (*{5164, 18}*) Do[l[[All,i]]=Ordering[matrix1[[All,i]]],{i,1,18}]; Do[Do[Orderedcellcycle[[i,j]]=annotations[[l[[i,j]],6]],{i,1,200}],{j, 1,18}]; In[678]:=gcounter=scounter=gmcounter=mgcounter=sgcounter=0; In[679]:=Do[Do[If[Orderedcellcycle[[i,j]]=="G1",gcounter=gcounter +1,gcounter=\ gcounter+0],{i,1,200}]; Do[If[Orderedcellcycle[[i,j]]=="S",scounter=scounter+1,scounter= scounter+0],{i,1,200}]; Do[If[Orderedcellcycle[[i,j]]=="S/G2",sgcounter=sgcounter +1,sgcounter= sgcounter+0],{i,1,200}]; Do[If[Orderedcellcycle[[i,j]]=="G2/M", gmcounter=gmcounter+1,gmcounter=gmcounter+0],{i,1,200}]; Do[If[Orderedcellcycle[[i,j]]=="M/G1",mgcounter=mgcounter +1,mgcounter= mgcounter+0],{i,1,200}],{j,1,18}]