Seasons greetings cdb experts, and many thanks in advance!

In the code below I first create the set of matrices `Kl`

, then try to pick out the components of one of the matrices (`K1`

in the example) and display them.

My actual goal is to display a matrix with the right values in a nice LaTeX format.

If you run the code below, you will notice that I try to change the `i,j`

element of a matrix but despite the `element.replace()`

, the final `TheK1Matrix`

has values {12, 21} and not values {1, -1}. My questions are:

- How to set the
`i,j`

element of the matrix below?

```
from cdb.core.component import *
from cdb.utils.node import *
{k,l,m,n}::Indices(rotation, values={1,2,3}).
\epsilon{#}::EpsilonTensor.
Kl := (K_{l})_{m n} = \epsilon_{l m n};
evaluate(Kl, rhsonly=True);
TheK1Matrix := [[0,0,0],[0,0,12],[0,21,0],].
for ex in Kl[r'\equals']:
lhs = get_lhs(ex.ex())
rhs = get_rhs(ex.ex())
if ${a?,b?,c?}$.matches(lhs):
n = int(str(nth_arg(lhs,0)))
if n == 1:
i = int(str(nth_arg(lhs,1)))
j = int(str(nth_arg(lhs,2)))
for element in TheK1Matrix[i-1][j-1]:
element;
rhs;
element.replace(rhs);
TheK1Matrix;
```

- Ultimately, my goal is to display that matrix using "nice" LaTeX formatting, of the general form

```
\begin{array}
0 & 0 & 0 \\
0 & 0 & 1 \\
0 & -1 & 0
\end{array}
```

How to achieve that?

Thank you

GPN