Dear all,
1) I have a very large matrix of 
str(keep) 
 num [1:153899, 1:3415] -98.6 -95.8 -96.4 -95.8 -98 ... 
that  I would like to reduce its size to something like

str(keep) 
 num [1:1000, 1:3415] -98.6 -95.8 -96.4 -95.8 -98 ...  
or anything similar in size as this is a matrix that needs plotting (so is ok if it is 1000 row, 995, or 1123)

I think what I need here is a way of selecting multiple rows and averaging per column (notice that the column number should stay the same)

b. I would like to be able to convert strings that are function names to real function calls. For example I have something like

LogFunction<- function(){}
FunctionIndex<- rbind (c(1,"LogFunction"),
               c(2,"TakeFunction")
              )
print(sprintf('Using the function %s',FunctionIndex[1,1]))
# call the FunctionIndex[1,1] somehow 



I would like to thank you in advance for your help

Regards
Alex

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