entering vectors and +/ sign

08092014, 11:47 AM
Post: #1




entering vectors and +/ sign
I can't figure out what's the usefulness of +/ symbol when entering vectors (i.e. if [] brackets are hit, the brackets appear as [x +/]. What does +/ do inside the brackets?
Cheers! 

08092014, 03:08 PM
Post: #2




RE: entering vectors and +/ sign
Expands and contracts rows/columns, and enables one to traverse large matrices quickly with the arrow keys. Hit  or + when you're on the symbol and you'll see.


08092014, 04:50 PM
Post: #3




RE: entering vectors and +/ sign
(08092014 03:08 PM)Helge Gabert Wrote: Expands and contracts rows/columns, and enables one to traverse large matrices quickly with the arrow keys. Hit  or + when you're on the symbol and you'll see. Less well known is the fact that pressing × (multiply) creates a new row or column BEFORE the current one (unlike + which creates it AFTER the current one). It's the only way to insert a new first row or new first column. <0ɸ0> Joe 

08092014, 10:30 PM
Post: #4




RE: entering vectors and +/ sign
Thanks   I learned something, too!


08112014, 10:49 AM
Post: #5




RE: entering vectors and +/ sign
Thanks!
On somewhat related topic: how do I convert a row (or column matrix) to a vector (i.e. lose double square brackets? 

08112014, 12:47 PM
Post: #6




RE: entering vectors and +/ sign
I don't recall seeing a command to convert singlerow/column matrices into vectors.
Workaround for a single row matrix: 1. Store the matrix. For example, M0. 2. Execute M0(1). Example: Starting with [[4,2]]: M0:= [[4,2]] M0(1) returns [4,2] 

08112014, 04:24 PM
Post: #7




RE: entering vectors and +/ sign
(08112014 10:49 AM)mcjtom Wrote: On somewhat related topic: how do I convert a row (or column matrix) to a vector (i.e. lose double square brackets? From the keyboard, just copy it to the edit line, place the cursor anywhere within the singlerow matrix, and press Shift 5 (the squarebracket key). Shift 5 toggles between matrix and vector. Very handy. <0ɸ0> Joe 

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