11 questions linked to/from Head of a MatrixForm expression?
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### what does Out store? [duplicate]

I think the following can only be tested in a notebook. (Please correct me if not.) ...
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### Out[x] not the same as assigned expression [duplicate]

There seems to be a difference in the way Mathematica assigns a value to a variable and the way it assigns a value to the next Out object. I don't understand why this is happening. For instance, take ...
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### Why does MatrixForm affect calculations?

This is a really newbie question, but it has me confused. Why does this code work without // MatrixForm and doesn't work with ...
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### Why is there no PositionFunction in Mathematica?

Too often I have seen the programs of inexperienced users greatly slowed by using Position in an iterative fashion, when far faster would have been to compute a ...
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### How can I reproduce the MatrixForm, NumberForm, XyzForm behavior?

I wish to write a function like MatrixForm, that affect only display but not evaluation, i.e. a function that automatically is stripped away from output. More ...
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### Schrödinger's MatrixForm: feature or bug?

Recently I noticed a peculiar behavior of MatrixForm that I failed to find a way to explain. Consider the following example: ...
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### Creating a TeXForm/TraditionalForm/etcForm - like function

How could we go about creating a function that behaves like those? After a while thinking, my best try is with CellPrint printing an ...
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### After NumberForm I cannot apply a Sine function. Why?

After NumberForm I cannot apply a Sine function. Why? This works: sol1 = x /. Solve[x^2 - 3 == 0, x] Sin[sol1] Output = $\{-Sin[\sqrt{3}],Sin[\sqrt{3}]\}$ Also ...
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### Revert FullForm back to "normal"

I am trying to find the function that converts the result of FullForm back into a standard pretty looking output. Here is what I mean: ...
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### Classification of Forms and understanding what goes into \$PrintForms, \$OutputForms, Out[x]//XXXForm=, and what does not

Mathematica has lots of Forms. Some of those appear in \$PrintForms, like InputForm, ...
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