Wolfram Mathematica is not showing this matrix operation in matrix form

Question

I hope you can help me with this. I've defined two matrix, i and T, and I want to operate them this way:

but, as you may see, it simply shows the sum of the two matrices.

I don´t know what could it be.

Don't use MatrixForm. This is a formatting construct for display purposes. — bill s, May 08 '21 at 21:24
You might want to learn how to deal with Matrices. Here is one source: https://www.cfm.brown.edu/people/dobrush/am34/Mathematica/ch1/matrix.html — bill s, May 08 '21 at 21:37
You have to extract the real matrix from the wrapper MatrixFrom[]. It is the first part inside : m1 = MatrixForm[{{a, b}, {c, d}}]; m2 = MatrixForm[{{x, y}, {z, t}}]; MatrixForm[m1[[1]] + m2[[1]]] — andre314, May 08 '21 at 22:00
Carxs, it will be helpful for others to fully understand your question & be able to help solve your problem, along with improving the experience of future users coming across this QA if you can do what others have commented about re: the definition of i and T; and it will be especially helpful to be more descriptive of what errors you encounter when you say “It still doesn’t work”. — CA Trevillian, May 09 '21 at 00:28
See https://mathematica.stackexchange.com/q/3098/4999 and https://mathematica.stackexchange.com/a/18395 (point 8) — Michael E2, May 09 '21 at 01:04
Does this answer your question? Why does MatrixForm affect calculations? — Michael E2, May 09 '21 at 01:08

score 2 · Answer 1 · answered May 08 '21 at 22:01

2

You apparently defined i and T using MatrixForm, which makes printable things that aren't matrices for purposes of calculation. Try MatrixForm[i-T/.MatrixForm->Identity]. Or, just avoid MatrixForm when intending to do calculations with matrices.

answered May 08 '21 at 22:01

John Doty

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Why would someone (-1) this? – CA Trevillian May 09 '21 at 00:25
I didn't downvote, but it is perfectly reasonable to downvote a question that doesn't post copyable code. Or a question far larger than necessary: always post the MINIMUM question. – David G. Stork May 09 '21 at 04:23

Wolfram Mathematica is not showing this matrix operation in matrix form

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