Do you have the equations written out in LaTeX so I could understand the
system better?
On 3/21/23 10:25 AM, [email protected] wrote:
I have a couple problems with this “answer”, which roughly replace the
transcendental function calls (which are indeed bijections) with
symbols and solving for these symbols.
The most serious is that the transformed expressions are rational
functions, and he proposed solution solves for their numerators. The
author failed to note that for each proposed solution, the
denominators are zero, meaning that the expressions are undefined at
these points. Using those propôsed solutions require serious
justifications (e. g. computing the limits of the (transformed)
expressions at these points).
See my answer
<https://github.com/sympy/sympy/issues/24824#issuecomment-1474975520>.
Le mardi 7 mars 2023 à 04:18:07 UTC+1, [email protected] a écrit :
An answer is given in https://github.com/sympy/sympy/issues/24824
On Sunday, March 5, 2023 at 1:26:50 PM UTC-6 [email protected] wrote:
I think you should simplifythe equation and reduce the
computational complexity as much as possible. It may also be
helpful to check the implementation for errors or potential
issues with the input parameters.
On Tuesday, 28 February 2023 at 21:35:24 UTC+5:30
[email protected] wrote:
Hi all,
I try to solve a non linear equation but it conitnue
runiing since 48 hours now.
``
import sympy as sp
X = sp.MatrixSymbol('X',2,2)
W = sp.MatrixSymbol('W',2,2)
Y = sp.MatrixSymbol('Y',1,2)
W_X = sp.MatMul(W,X.T)
liste = []
for i in range(W_X.shape[0]):
row = []
for j in range(W_X.shape[1]):
row.append(1/(1+sp.exp(-W_X[i,j])))
liste.append(row)
sigmoid = sp.Matrix(liste)
liste = []
for i in range(Y.shape[0]):
row = []
for j in range(Y.shape[1]):
row.append(sp.log(Y[i,j]/(1-Y[i,j])))
liste.append(row)
log_Y = sp.Matrix(liste)
test = sigmoid.inv()
W2 = sp.MatMul(log_Y,test).as_explicit()
liste = []
for index in range(W2.shape[1]):
for i in range(W.shape[0]):
for j in range(W.shape[1]):
liste.append(W2[index].diff(W[i,j]))
p = sp.solve(liste,list(W),check=False,manual=True)
```
Do someone have an idea where i am wrong or if it is from
sympy ?
Thanks a lot
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