entering vectors and +/- sign - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: HP Prime (/forum-5.html) +--- Thread: entering vectors and +/- sign (/thread-1946.html) entering vectors and +/- sign - mcjtom - 08-09-2014 11:47 AM 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! RE: entering vectors and +/- sign - Helge Gabert - 08-09-2014 03:08 PM 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. RE: entering vectors and +/- sign - Joe Horn - 08-09-2014 04:50 PM (08-09-2014 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. RE: entering vectors and +/- sign - Helge Gabert - 08-09-2014 10:30 PM Thanks - - I learned something, too! RE: entering vectors and +/- sign - mcjtom - 08-11-2014 10:49 AM Thanks! On somewhat related topic: how do I convert a row (or column matrix) to a vector (i.e. lose double square brackets? RE: entering vectors and +/- sign - Eddie W. Shore - 08-11-2014 12:47 PM I don't recall seeing a command to convert single-row/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] RE: entering vectors and +/- sign - Joe Horn - 08-11-2014 04:24 PM (08-11-2014 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 single-row matrix, and press Shift 5 (the square-bracket key). Shift 5 toggles between matrix and vector. Very handy.