Le forum de XCAS

Hello,

Thank you for including me in this forum.

I have been using xcas for a while and was wondering if there is a way to rearrange terms as was possible in the HP48GX. Moving terms and collecting on subexpressions to achieve a desired form for a solution.

Any suggestions?
Thank you in advance
Matt

Yes, you can rearrange terms interactively inside an expression editor. For more information, please look at the Expression editor section in the interface help manual (Help->Interface in xcas or open file:///usr/share/giac/doc/en/casinter/node6.html under linux/ add local after usr for mac, c:\xcas\doc\en\casinter\node6.html under windows)

I looked at the expression editor. I am not sure how to put an existing expression or equation into the editor. Also, I was looking for the ability to rearrange terms, distribute into a parenthesis, swap terms etc. In the HP48 you have a lot of freedom to merge terms, move terms, swap, etc. It appears that using normal or factor on a selected subexpression is most of it. I appears more adapted to entering equations.

I hope this makes sense.

Matt

You can paste an existing equation with Ctrl-C/Ctrl-V. Then up-arrow to select it, and you can re-arrange it. You can apply any command (taking one argument) from the main menu, it is not limited to those from the M menu of the expression editor. If you want to swap terms, select one, use Ctrl-left or right arrow.

parisse a écrit :You can paste an existing equation with Ctrl-C/Ctrl-V. Then up-arrow to select it, and you can re-arrange it. You can apply any command (taking one argument) from the main menu, it is not limited to those from the M menu of the expression editor. If you want to swap terms, select one, use Ctrl-left or right arrow.

When I paste in an equation using Ctrl-C it appears to be entered as a string (it has a double quote at the beginning) and any operation yields an error message "bad argument".

If you are in string mode, press the " key, it will come back to normal mode.

Is there a way to change an normal entry line to an expression editor line (without creating a new expression editor line and pasting in?)

I hope that was clear

No, not currently. The shortest path is Ctrl-A, Ctrl-C, Alt-E, Ctrl-V, downarrow, "

I understand the expression editor now. The editor in the HP48 could distribute a multiplier into a quantity, invert, move parentheses etc. I had wished for that. It would need to operate on equations that were the result of other operations like solve or subst.

I find I am using XCAS more and more. The combination of XCAS and Octave makes a powerful tool for modeling and other engineering tasks.

Thank you.