How do you put text below other text? - math

I need to write the expression meaning optimize over the parameter set. I think I should write something like
$\arg \max_{\substack{w \\ \phi}} f(w,\phi)$
but this puts the subscript below at the right of \max and I'd like to put those subindexes below and centered on the max word.
Which command should I use?
Thanks in advance.


See: http://www.breakthru.altervista.org/?p=27
using
\underset{x}{\operatorname{argmax}}


Have you tried display mode math instead of text mode math. That is, try either:
$\displaystyle\arg \max_{\substack{w \\ \phi}} f(w,\phi)$
Or try:
\[ \arg \max_{\substack{w \\ \phi}} f(w,\phi) \]


$\arg \max\limits_{\substack{w\\ \phi}} f(w,\phi)$


Use this statement. It will surely work. Update the parameters as per your requirement :
max┬(0≤x≤1)⁡〖xe^(-x^2 ) 〗

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You have given extra space before and after the =
The second way which you tried and suggested in other answers will work:
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You may try using escape character "" and try something like this :
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ext='"EXT' should work (at least in bash).
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Expanding on Andrie's answer:
Another way to write absolute value is
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To automatically adjust the size of the vertical lines to what's inside them, use
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In your case, this becomes:
$$MAPE = \frac{1}{n} \sum_{d_i} (\frac{1}{q} \sum_{t_j}\left\lvert{\frac{gap_{i,j}-s_{i,j}}{gap_{i,j}}}\right\rvert)$$
edit: When I originally posted this answer, I couldn't embed images yet. Now replaced link with embed.

Using mathjax, you can use the "pipe" symbol |to indicate absolute values.
Try this:
$$ |-3| $$
In your case:
$$MAPE = \frac{1}{n} \sum_{d_i} (\frac{1}{q} \sum_{t_j} |\frac{gap_{i,j}-s_{i,j}}{gap_{i,j}}| )$$
This gives:

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Can you not use the operator?
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