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Groups > comp.soft-sys.math.mathematica > #2805
| From | Bill Rowe <readnews@sbcglobal.net> |
|---|---|
| Newsgroups | comp.soft-sys.math.mathematica |
| Subject | Re: Simple question: is it possible to take a derivative and solve for x ? |
| Date | 2011-05-30 10:33 +0000 |
| Organization | Steven M. Christensen and Associates, Inc and MathTensor, Inc. |
| Message-ID | <irvrq1$8h0$1@smc.vnet.net> (permalink) |
On 5/29/11 at 7:36 AM, t27026t@yahoo.com.br (Alonso) wrote: >I am a beginner, and would like to know if it is possible to solve >for x the first derivative of a long equation in Mathematica. Bear >with me, my background is in Biomedical Sciences. >I am typing the following command: >Solve[D[((x*l1 + (1 - x)*l2)/((x^2*v1 + (1 - x)^2*v2 + 2*x*(1 - >x)*c)^0.5))+((x*L1 + (1 - x)*L2)/((x^2*V1 + (1 - x)^2*V2 + 2*x*(1 - >x)*C)^0.5)), x]==0,x] >But Mathematica 8 simply stops, and no output is given. A portion of the difficulty is likely to be the term 2*x*(1 - x)*C)^0.5) C cannot be used as a variable since it has built-in meaning. Try changing this to a lower case c and see if that helps. It is a good idea to avoid using single upper case letters as variables so as to avoid conflicts with built-in symbols.
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Re: Simple question: is it possible to take a derivative and solve for x ? Bill Rowe <readnews@sbcglobal.net> - 2011-05-30 10:33 +0000
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