Hallo Berthold, Niketan,
Thanks for your helpful answers.
Finally, I've done following implementations:
which with for loop
A = matrix("1 3 5 2 4", rows=5, cols=1)
which = function (matrix[double] A) return (matrix[double] R) {
R = matrix(0, 0, 1);
n = nrow(A)
for( i in 1:n ) {
if(as.scalar(A[i,1]) > 0) {
R = rbind(R, matrix(as.integer(i), 1, 1))
}
}
}
A2 = A>2
R = which(A2)
which with replace (Thanks to Niketan, I've understood the removeEmpty
syntax ,finally )
A = matrix("1 3 5 2 4", rows=5, cols=1)
which = function (matrix[double] A) return (matrix[double] R) {
R = removeEmpty(target=A*seq(1, nrow(A)), margin="rows")
}
C = A>2
R = which(C)
is.na
A = matrix("1 3 5 0 4", rows=5, cols=1)
A[3,1] = A[3,1]/0
is_na = function (matrix[double] A) return (matrix[double] R) {
R = A == 1/0
}
R = is_na(A)
Kuno
-Original Message-
From: Berthold Reinwald [mailto:reinw...@us.ibm.com]
Sent: Samstag, 7. Juli 2018 02:12
To: dev@systemml.apache.org
Subject: Re: which() Function in SystemML
You may also look at example 2 "Replace NaN with mode" in our "DML Tips and
Tricks" examples notebook. Will add a which() example shortly.
https://github.com/apache/systemml/raw/master/samples/jupyter-notebooks/DML%20Tips%20and%20Tricks%20(aka%20Fun%20With%20DML).ipynb
Regards,
Berthold Reinwald
IBM Almaden Research Center
office: (408) 927 2208; T/L: 457 2208
e-mail: reinw...@us.ibm.com
From: "Niketan Pansare"
To: dev@systemml.apache.org
Date: 07/05/2018 10:26 AM
Subject:Re: which() Function in SystemML
Hi Kuno,
Thanks for trying out SystemML. One way to implement your logic in SystemML is
as follows:
X = matrix("1 4 -99 2 5 -99", rows=6, cols=1) Y = removeEmpty(target=(X >
2)*seq(1, nrow(X)), margin="rows") print("\nIndexes:\n" + toString(Y))
For handling NAs, you can replace NAs by certain value (in this case -99 or one
of the builtin constants, i.e. Inf or NaN ... see
https://github.com/apache/systemml/blob/master/src/test/scripts/org/apache/sysml/api/mlcontext/builtin-constants-test.dml
) using the "na.strings" parameter of the transform builtin function (
http://apache.github.io/systemml/dml-language-reference.html#transforming-frames
).
Hope this helps.
Regards,
Niketan Pansare
IBM Almaden Research Center
E-mail: npansar At us.ibm.com
http://researcher.watson.ibm.com/researcher/view.php?person=us-npansar
"Baeriswyl Kuno (IT-SWE-CC1-JV6)" ---07/05/2018 05:29:53 AM---Hello, I'm a
developer want to use SystemMl for running R-Code from our business people on a
Spark c
From: "Baeriswyl Kuno (IT-SWE-CC1-JV6)"
To: "dev@systemml.apache.org"
Date: 07/05/2018 05:29 AM
Subject: which() Function in SystemML
Hello,
I'm a developer want to use SystemMl for running R-Code from our business
people on a Spark cluster.
I've studied http://apache.github.io/systemml/dml-language-reference , however,
haven't found a implementation of the R function "which" or any alternative
functionality. Has anyone an idea how I could
# Given
v = c(1,4,NA,2, 5, NA)
# Expect indexes where value meets condition = int[] 2 5
v2 = which(v>2)
# Expect indexes where is.na returns TRUE = int[] 3 6
v3 = which(is.na(v))
I've already considered the functions replace() and removeEmpty(), but they
don't exactly meets my needs.
Thanks a lot in advance
Kuno