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Error from NDSolve: PDE coefficient doesn't evaluate to numerical value

Nithiya V
Posted 2 months ago

while I'm solving system of pde it is showing the error that "Equation or list of equations expected instead of "

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POSTED BY: Nithiya V
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Nithiya V
Nithiya V
Posted 2 months ago

In that code I'm getting as "Pde coefficient {0,} does not evaluate to a numeric matrix of dimensions {1,2} at the coordinate {0.5,0.5}; it evaluated to {0.,} instead.I have attached the image of error I'm getting as well as the notebook
POSTED BY: Nithiya V

There is an anomalous, invisible character in your first equation:

In[12]:= op1 // InputForm

Out[12]//InputForm=
\:f870*Derivative[0, 1][v][x, y] + 
 Derivative[1, 0][u][x, y]
POSTED BY: Gianluca Gorni
Nithiya V
Nithiya V
Posted 2 months ago

Thank you for your response. Now I'm facing another issue that I haven't use findroot but it showing the error on that part ill be attaching the notebook as well as the screenshot of what I'm getting as error.&
POSTED BY: Nithiya V

Welcome to Wolfram Community! Please make sure you know the rules: https://wolfr.am/READ-1ST

The rules explain how to format your code properly. Posting code Images doesn't help other members to copy your code. Please EDIT your post and comment, and make sure code blocks start on a new paragraph and look framed and colored like this.

int = Integrate[1/(x^3 - 1), x];
Map[Framed, int, Infinity]

You can also embed notebook or attach notebook.

enter image description here
POSTED BY: EDITORIAL BOARD

You are missing an equals, that is, ==, in the long expression. Perhaps you want to set it equal to zero, or perhaps you accidentally deleted part of the equation.
POSTED BY: Michael Rogers
Nithiya V
Nithiya V
Posted 2 months ago

Thank you for your reply, sir. Now I'm getting another error sir I have attached screenshot
POSTED BY: Nithiya V
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