search for: purna

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2012 Oct 25
3
problem in finding sizes of objects using a for loop
...seq_along(objects)){ + print(c(objects[i],object.size(objects[i]))) + + } [1] "x" "64" [1] "y" "64" The result obtained by me is wrong in second case. I understood that variables x and y are treated as characters. But to rectify this problem. Regards, Purna
2012 Oct 25
2
Regarding the memory allocation problem
...Q) Here what I could not understand is, how come memory become insufficient when dealing with 4th chunk? Q) Suppose if i computed a matrix 'm' during calculation associated with chunk1, then is this matrix not replaced when I again compute 'm' when dealing with chunk 2? Regards, Purna
2013 Jan 22
1
How to remove the vertical space between two graps
...quot; in the second attempt I'm able to place the bars next to each other using "beside=T" argument. However, I fail when I use "beside=F" argument (obtained plot3.tiff with this). Can you suggest me in achieving my goal (similar to plot2 with no vertical space)? Regards, Purna
2012 Oct 08
3
turn list into dataframe
Dear R users, I'm starting to use 'apply' functions rather than for loops in R, and sometimes the output is a bit different than what I want. In this case, the command was tapply(myvector,myindex,cumsum) And the output was something like this: $`SNRL1 Core 120` [1] 2.8546 4.0778 5.2983 6.3863 7.5141 8.5498 9.5839 10.6933 $`SNRL1 Core 230` [1] 7.6810 8.7648 9.8382
2012 Oct 09
2
Text file: multiple matrix
Hi there! I'm a newbie in R This is my problem: I have a txt file composed by 100 matrix (256x256) separated by a blank line! How can I save automatically the matrix in separated txt file (100)? e.g. 1? matrix from line 1 to line 256 257 blank line 2?matrix from line 258 to line 513 514 blank line 3? matrix from line 515 to line 770 771 blank line 4? matrix from line 772 to line 1027......
2010 Sep 26
1
matrix help
Anyone know how write a function that solves: (1 + c)x1 +x2 +x3 = 5 x1 +(1 + c)x2 +x3 = 5 + 2c x1 +x2 +(1 + c)x3 = 5 + 3c, where c is a small constant, for 1000 equidistant values c = (10^-14, 2*10^-14, ..., 10^-11) by using cholesky decomposition? /P -- View this message in context:
2012 Oct 08
1
Any better way of optimizing time for calculating distances in the mentioned scenario??
...present in a matrix using 'dist()' function? Which means, suppose if a matrix 'x' having 20 rows, is it not possible using 'dist()' to calculate only distance of 1st row vector from other 19 vectors. 3) Any other ideas to optimize the problem i'm facing with. Regards, Purnachander