Vector Arithmetic on the Casio fx-991CW - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: Not HP Calculators (/forum-7.html) +--- Forum: Not remotely HP Calculators (/forum-9.html) +--- Thread: Vector Arithmetic on the Casio fx-991CW (/thread-20351.html) Vector Arithmetic on the Casio fx-991CW - Matt Agajanian - 08-21-2023 05:05 AM Before you go into a laughing spell, have a look at this. I decided on a challenge. How do I perform Vector Arithmetic on the CW. Beginning with the example from the HP-21 manual, I just had to give it a go. Fishing around to see the idiosyncrasies the entry and result characteristics of how the Casios work with Rectangular/Polar coordinates and the number entry in each format, a+bi and r∠θ. After a few ideas and tests with the HP-21 example, I successfully devised a methodology. Here’s the MS Word file describing the process. From the looks of the procedure, it could easily be adjusted for the 115 and 991 series. One more reason I don’t need to use the CW as a doorstop or paperweight. Besides, I spent good money on it, so I should give it a chance to prove itself. HP-21 Vector Arithmetic for fx-991CW RE: Vector Arithmetic on the Casio fx-991CW - Eddie W. Shore - 08-21-2023 01:14 PM I plan to do vector operations for the HP 15C (CE) this week. RE: Vector Arithmetic on the Casio fx-991CW - Matt Agajanian - 08-21-2023 05:33 PM (08-21-2023 01:14 PM)Eddie W. Shore Wrote:  I plan to do vector operations for the HP 15C (CE) this week. Glad to be of help. Take a tip from the 25 & 29C manuals as they have statistics and you can add/subtract the vectors with Σ+/Σ- and recall the sums with RCL Σ+.