Re: [R] number of an element in a matrix

2008-08-12 Thread Petr PIKAL
Hi [EMAIL PROTECTED] napsal dne 11.08.2008 22:50:08: You can use the length() and which() functions for that: length(which(m == 2)) Or simply sum(m == 2) Regards Petr cheers, brandon rostam shahname wrote: Hi, I wonder if there is any function which gives the number of times

[R] number of an element in a matrix

2008-08-11 Thread rostam shahname
Hi, I wonder if there is any function which gives the number of times which an element is repeated in the matrix. Let say there is a matrix, I would like to find out how many times number 2 has been repeated in the matrix, or in other words, how many elements of the matrix are equal 2. Thanks for

Re: [R] number of an element in a matrix

2008-08-11 Thread Brandon Invergo
You can use the length() and which() functions for that: length(which(m == 2)) cheers, brandon rostam shahname wrote: Hi, I wonder if there is any function which gives the number of times which an element is repeated in the matrix. Let say there is a matrix, I would like to find out how

Re: [R] number of an element in a matrix

2008-08-11 Thread Roland Rau
Hi, Brandon Invergo wrote: You can use the length() and which() functions for that: length(which(m == 2)) Or even shorter since TRUE Values have a value of 1 mymatrix - matrix(sample(x=1:10, size=1000, replace=TRUE), ncol=5) sum(mymatrix==2) length(which(mymatrix==2)) #should give the same

Re: [R] number of an element in a matrix

2008-08-11 Thread Henrique Dallazuanna
Try this: mat - matrix(sample(1:50, 100, rep = TRUE), 10) table(mat)[which(table(mat) == 2)] On 8/11/08, rostam shahname [EMAIL PROTECTED] wrote: Hi, I wonder if there is any function which gives the number of times which an element is repeated in the matrix. Let say there is a matrix, I would

Re: [R] number of an element in a matrix

2008-08-11 Thread Horace Tso
How about x = matrix(sample(1:10, 100, replace=T), ncol=10) table(as.vector(x)) -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of rostam shahname Sent: Monday, August 11, 2008 1:42 PM To: r-help@r-project.org Subject: [R] number of an element in a matrix

Re: [R] number of an element in a matrix

2008-08-11 Thread Horace Tso
My last email went out faster than I could think. Actually no need to coerce a matrix to a vector. x = matrix(sample(1:10, 100, replace=T), ncol=10) table(x) H -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Horace Tso Sent: Monday, August 11, 2008