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+--- Thread: How to convert a single row list to matrix or vector? (Solved) (/thread-5161.html)
How to convert a single row list to matrix or vector? (Solved) - cclinus - 11-19-2015 03:18 PM
Hi,
How to convert a single row list to matrix or vector in program?
For example A:={1,2,3,4}
list2mat doesn't work for {1,2,3,4}.
I can use M0:={1,2,3,4} to obtain a vector.
But, I want to use local variable only.
Please help!
Regards,
RE: How to convert a single row list to matrix or vector? - Han - 11-19-2015 03:32 PM
(11-19-2015 03:18 PM)cclinus Wrote: Hi,
How to convert a single row list to matrix or vector in program?
For example A:={1,2,3,4}
list2mat doesn't work for {1,2,3,4}.
I can use M0:={1,2,3,4} to obtain a vector.
But, I want to use local variable only.
Please help!
Regards,
list2mat(list, width) - if list has n elements, then this creates a matrix of dimension (n/width) x width
list2mat({1,2,3,4},2) makes a 2x2 matrix using 1,2 for row 1 and 3,4 for row 2.
list2mat({1,2,3,4},4) makes a 1x4 matrix using 1,2,3,4 for the single row. If you want a row vector (i.e. not a 1x4 matrix) you can do something like:
m:=list2mat({1,2,3,4},4);
m(1); // returns just the first row [ 1, 2, 3, 4 ]
RE: How to convert a single row list to matrix or vector? - Helge Gabert - 11-19-2015 03:34 PM
TRN(list2mat({1,2,3,4},1)) ? Here you don't need to know n (number of columns). Might be useful in a program.
RE: How to convert a single row list to matrix or vector? - Didier Lachieze - 11-19-2015 03:41 PM
transpose(list2mat({1,2,3,4},1)) returns [[1 2 3 4 ]]
col(list2mat({1,2,3,4},1),1) returns [1 2 3 4]
[attachment=2818]
RE: How to convert a single row list to matrix or vector? - cclinus - 11-19-2015 04:47 PM
Thanks everybody!