Taylor Expansion not working

08142015, 05:38 PM
Post: #1




Taylor Expansion not working
Hello,
I have been a long time user of the 48SX and GX and just got a 50g to replace the SX. So....and now I want to do a taylor expansion of sqrt(0.2*x+1) So...first when i assemble the root is asks me to turn on approx mode  OK I put on the stack > sqrt(etc) >'X' >5 and i get the message: "Approx mode off" ...OK... Next it s popup: "TAYLR error: Mode switch not allowed here " hmmmmm.....works on the SX. Can someone give me a hint how to do that? Wolfram 

08142015, 06:54 PM
(This post was last modified: 08142015 06:56 PM by Gerson W. Barbosa.)
Post: #2




RE: Taylor Expansion not working
Try replacing 0.2*X with X/5


08142015, 07:25 PM
Post: #3




RE: Taylor Expansion not working  
08142015, 08:33 PM
Post: #4




RE: Taylor Expansion not working
(08142015 07:25 PM)wneff Wrote:(08142015 06:54 PM)Gerson W. Barbosa Wrote: Try replacing 0.2*X with X/5 In exact mode, '√(231/1000000*X+1296480889/10000000000)' 'X' 3 TAYLR > '5788125000*√1296480889/1637269993841868597755699*X^355125*√1296480889/13891427235886201*X^2+21*√1296480889/2357237980*X+√1296480889/100000' You might need to set flag 79 (Textbook off). HTH, Gerson. 

08142015, 09:37 PM
Post: #5




RE: Taylor Expansion not working
(08142015 08:33 PM)Gerson W. Barbosa Wrote:(08142015 07:25 PM)wneff Wrote: Ok, this equation was just an example ..i actually need (0.000231*x+0.1296480889)^0.5 Super that worked! Thanks a lot. Now  this seems weird to me that it can't just give me the polynomila numbers as decimals  is there a way to chenage settings to get that done? 

08172015, 05:16 PM
Post: #6




RE: Taylor Expansion not working
Hello,
I believe you can use the >Q command under the Convert>Rewrite menu to do the conversion from decimal to fractional automatically, at least it seems to be working on your example, giving Code: sqrt(1/4329*X+129/995) After that you could perform the Taylor expansion. Hope this help. 

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