# Tagged Questions

Questions on the manipulation of matrices in Mathematica.

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### Expanding a matrix in a set of matrices

Consider a vector $a=\{a1,a2,a3\}$. I computed $e^{i a\cdot \sigma}\qquad \sigma: {\rm Pauli\ matrices}$ and then applied the command ExpToTrig. Now I want to expand the above result in terms of ...
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### Probems using 2 For and a AppendTo to cycle through my Equation to solve some matrixes

I am trying to solve a few problems here. I have an equation with multiple variables that I am trying to solve in For loop method. I will attach the file below. In addition I am trying to get it to ...
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### how to update elements in a matrix with position identified in a list

I am new to mathematica. Could you pls help me on how to write this: I have a $5\times 10$ matrix, for example, ap = ConstantArray[0.001, {5, 10}] I have the ...
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### Kronecker product

I have a problem, I want to compute kronecker product as given below; ...
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### How to automate a computation and save the outputs?

I'm working with neutrino oscillations in matter and i'm computing the oscillation probabilities as functions of the Energy. This is what i have ...
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### Dynamic input for Complex, Determinant output problems [duplicate]

I'm having trouble using Complex with Dynamic real and imaginary inputs. The inputs come from a matrix of popup menus: ...
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### Group matrix values by column [closed]

Original Question: I have a list {{a, 1}, {b, 3}, {c, 1}, {d, 2}, {e, 3}}. I want to be able to group the the first number in each pair that has the same second ...
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### Plotting Matrix versus Matrix [closed]

So I recently started using Mathematica and I haven't been able to figure out how to simply plot elements of one matrix versus another matrix which are not directly related or are not a function of ...
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### Nonlinear matrix equation solving in Mathematica

is it possible to solve below equation in Mathematica? A.X+B.Exp[X]==C A, B are square ...
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