"When" comand
in [HP48]
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From: Giovanni on 26 Sep 2007 11:27 On Sep 24, 3:37 pm, Colin Croft <ccr...(a)removethis.hphomeview.com> wrote: > Wes wrote: > >>but an alternative way on the 83 is to type equation > >>and then the condition. > >>Ex: Graph y=x+2 for x>5 so you would type y1=x+2(x>5) > > > I think you meant to type y1=(x+2)(x>5). The parentheses around the x > > +2 are required to have the effect you want. The x>5 evaluates to > > either 1 (true) or 0 (false). This value is then multiplied by x+2 > > giving the result x+2 when true and 0 when false. If you turn off the > > graph axes (2nd-Format, AxesOff), you'll see that it's actually > > graphing 0 when false. > > A small point: it's better to graph y1=(x+2)/(x>5). Doing it this way > means that the function is undefined outside the domain since you are > dividing by zero (boolean false). This has the advantage that you do not > get the jagged vertical line joining the last defined value to the x > axis as you do if the function is going from a defined value of x+2 to > being zero. Being undefined, it simply stops. Thank you for your advice!
From: Speed on 30 Sep 2007 14:55 On Sep 21, 2:48 pm, Giovanni <giovanni0ferre...(a)gmail.com> wrote: > Hi! > I recently used a TI-89 Titanium (I'm, sorry, but I had to...) instead > of my 50g and I noticed the presence of a comand named "when". This > comand allows the user to plot a system of equation. For example, if > one condition is "x>0", then you can tell the calculator to plot > "cos(abs(x))" if the first condition is true; you can then tell the > calculator to plot "cos(x)" if "x<0". > My question is: is there something similar for the 50g, too? I tried > to write "WHEN" in the eqw, when I have to insert the function to > plot, and such a comand seems to exist because, if you digit "WHEN", > you can use brackets after this comand (for example, you're prevented > from to doing so if you digit some other letters, for instance > "asddfgggf"); thus, the calculator must "understand" the expression > "When" as a command; however, this is neither present in the "catalog" > menu nor in the User's Guide, so I don't know the syntax (which is > certainly different from the one used by TI-89 Titanium). > Any advice is welcomed! I seem to remember JYA calling the vertical line the "when" command. This was some time ago; I can't remember what it was relating to. I doubt that searching for "when" would yield any useful results. I can't seem to get it to handle inequalities though, so I'm not sure if this is helpful.
From: mats on 30 Sep 2007 16:16
Speed wrote: > I seem to remember JYA calling the vertical line the "when" command. it's not "when" but "where" (quite a different w-question ;-) The AUR tells me that it "substitutes values for names in an expression"... > This was some time ago; I can't remember what it was relating to. I > doubt that searching for "when" would yield any useful results. > > I can't seem to get it to handle inequalities though, so I'm not sure > if this is helpful. > |