Thanks for help
Okay, if I understand this, you want to remove all rows that have, for example, a 1 in any of ten columns: a<-matrix(sample(1:20,350,TRUE),ncol=10) # check it out a # first do it with a loop b<-a for(i in 1:ncol(b)) b<-b[b[,i]!=1,] b # now get tricky and do it in one operation no1s<-apply(a,1,function(x) any(1 %in% x)) no1s [1] TRUE FALSE FALSE FALSE FALSE TRUE FALSE FALSE FALSE FALSE FALSE FALSE [13] FALSE FALSE TRUE FALSE FALSE TRUE FALSE FALSE FALSE FALSE TRUE FALSE [25] TRUE FALSE TRUE TRUE FALSE TRUE FALSE TRUE FALSE FALSE FALSE c<-a[!no1s,] c Jim
On Fri, Mar 26, 2021 at 8:17 AM Goyani Zankrut <zankrut20 at gmail.com> wrote:
Example purpose I was created 21x2 matrix. My actual matrix is 35x10 matrix. So i have to ran same code 10 times for each columns. On Fri, Mar 26, 2021, 2:44 AM Goyani Zankrut <zankrut20 at gmail.com> wrote:
I understood that. c<-a[a[,1] != 1,] this will work for first column only. If I'm trying same by this c<-a[a[,1] !=2,] c<-a[a[,2] !=2,] Two times So i was tried for loop but I'm stucked. On Fri, Mar 26, 2021, 2:37 AM Jim Lemon <drjimlemon at gmail.com> wrote:
HI Goyani, What is happening is that rows and columns are mixed up. You have specified the sequence as 1:nrow(a) and then applied it to the columns a[,i]. The index error occurs because you have 21 rows but only two columns. That's the bad news. The good news is that you don't have to use a loop at all: c<-a[a[,1] != 1,] To see why, look at the expression inside the outer brackets: a[,1] != 1 It produces a logical vector that can be used to index the matrix as you wish. Jim On Fri, Mar 26, 2021 at 1:57 AM Goyani Zankrut <zankrut20 at gmail.com> wrote:
Sorry, I'm again disturbing you.
I have one problem which I'm trying to solve but getting no results.
Problem statement:
I created a combination matrix (dimensions 21 * 2). I want to remove
some entire rows which start with "1". I was tried lapply, apply, and
for loop for this but I'm still failing. I don't know how to do that.
I'm sharing the code and image for your reference in this email.
matrix row remove
a<- t(combn(7, 2))
for(i in 1:nrow(a)) {
c<- c(a[a[,i]!=1])
print(c)
}
# getting this result
[1] 2 2 2 2 2 3 3 3 3 4 4 4 5 5 6 3 4 5 6 7 4 5 6 7 5 6 7 6 7 7
[1] 1 1 1 1 1 1 2 2 2 2 2 3 3 3 3 4 4 4 5 5 6 2 3 4 5 6 7 3 4 5 6 7 4 5 6 7 5 6 7
[40] 6 7 7
Error in a[, i] : subscript out of bounds
[image: Mixmax]
<https://www.mixmax.com/?ref=Code%20snippet&userId=605ca35fdea6c2667fcbd315> Not
using Mixmax yet?
<https://www.mixmax.com/?ref=Code%20snippet&userId=605ca35fdea6c2667fcbd315>
I want the remaining matrix after removing those rows which starts with
1.
*"Healthy soil, Healthy life."*
*"A war based on Satyagraha is always of two kinds. One is the war we
wage against injustice, and the other we fight our won weaknesses."* - *Sardar
Patel*
*"You have to dream before your dreams can come true."* - *A. P. J.* *Abdul
Kalam*
*"Think before you print and save a tree."*
*ZANKRUT GOYANI*
*B.Sc. (Hons.) Agriculture*
On Tue, Mar 23, 2021 2:48 AM, Jim Lemon drjimlemon at gmail.com wrote:
Hi Goyani, I learned something, too, as you may have noticed. Dr Jim Lemon Gladesville, NSW AUSTRALIA I no longer have a university affiliation. Jim On Tue, Mar 23, 2021 at 3:43 AM Goyani Zankrut <zankrut20 at gmail.com> wrote:
Greetings of the day,
Sir, can you share your details so I can write them in my thesis
work. I want to write everyone's name and their designation & institute name. If you are not belonging to any institute, I mentioned your origin (City, state, Country).
I hope you will send these details.
Again thanks for the help.
"Healthy soil, Healthy life."
"A war based on Satyagraha is always of two kinds. One is the war we
wage against injustice, and the other we fight our won weaknesses." - Sardar Patel
"You have to dream before your dreams can come true." - A. P. J.
Abdul Kalam
"Think before you print and save a tree."
ZANKRUT GOYANI
B.Sc. (Hons.) Agriculture
*"Healthy soil, Healthy life."* *"A war based on Satyagraha is always of two kinds. One is the war we wage against injustice, and the other we fight our won weaknesses."* - *Sardar Patel* *"You have to dream before your dreams can come true."* - *A. P. J.* *Abdul Kalam* *"Think before you print and save a tree."* *ZANKRUT GOYANI* *B.Sc. (Hons.) Agriculture*