I have a problem with mathematica

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  • Thread starter Thread starter Reem Hashem
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Discussion Overview

The discussion revolves around a problem encountered in Mathematica related to a system of differential equations. The participant is trying to determine why the determinant of the system does not yield zero for certain variable values, as expected based on research findings.

Discussion Character

  • Technical explanation, Debate/contested, Mathematical reasoning

Main Points Raised

  • One participant describes their issue with Mathematica, noting that the determinant should be zero for specific values of variables but is not, leading them to question their implementation of the equations.
  • Another participant suggests that there may be discrepancies between the handwritten equations and their Mathematica representation, indicating that the translation may have introduced errors.
  • A different participant acknowledges the notation differences between the handwritten and Mathematica versions, expressing concern about the potential for typographical errors in the translation process.
  • One participant attempts to find a value for a variable that would make the determinant zero but reports confusion when the expected value does not yield the correct result.
  • The original poster shares their handwritten equations for comparison, hoping to clarify any discrepancies with their Mathematica code.

Areas of Agreement / Disagreement

Participants express differing views on the accuracy of the equations as written in Mathematica versus the handwritten version. There is no consensus on whether the issue lies in the equations themselves or in their translation into Mathematica.

Contextual Notes

Participants have noted potential typographical errors and differences in notation that may affect the interpretation of the equations. The discussion does not resolve these issues, leaving the source of the discrepancies unclear.

Who May Find This Useful

Individuals working with Mathematica on differential equations, those interested in mathematical modeling, or participants seeking assistance with technical translation of equations may find this discussion relevant.

Reem Hashem
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Hello,I need help in Mathematica,my problem is that I wrote the system of differential equations and I put a certain value of the variables and it is supposed that the value of the absolute of the determent would be zero but unfortunately I did not get zero , I got another answer
when I put R=0,S=0,h=0,a=3.127,w=3390 the absolute will be zero
but when I put R=5,S=8.2,a=3.116,w=3426,h=0 the answer was not zero which is supposed to be zero as what is written in the research.So Is my writing of the equation in mathematica wrong?
I wrote the equations by my hand writing and also in Mathematica,so I hope to Know where is the mistake in writing the system in Mathematica?and thanks for help
 

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I tried to see if your hand written y'[19]== and your Mathematica y'[19]== were the same and I can't get those anywhere near the same. I am guessing your translation into Mathematica has changed enough things that I cannot verify any of your more complicated equations.
 
Sorry Mr Bill ,but I think that you did not notice that in my hand writing I wrote that
m= (S+(h(w^0.5)+aR)(1-t) & K= a^2 w(1-t) so when you susitute them in the equations you will find that they are the same what I wrote in Mathematica
 
I did notice that, but the difference in notation between your handwriting and Mathematica makes it more difficult than I have the time to spend to repeat the complete translation myself to find what is perhaps a typographical error somewhere.

And there is at least as big a chance that I'll make a different typo trying to do the translation myself.
 
Last edited:
Compare between my handwriting & mathematica

Mr Bill ,thank you very much for helping me a lot, I sent the new equations in my handwriting ,I hope it will better this time to compare with what I wrote in mathematica
 

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Mr Bill I tried to find the value of (w=T) which makes the determinte =0 when R=5,a=3.116.S=8.2 by using FindRoot and I got that w= 2548.33 but when I used this value I did not get zero for the determinte and that which made me puzzled and confused added to that the right value of w should be 3426 as what is written in the research
 

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