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This is a list of [[Mathematica]] tips and tricks. | This is a list of [[Mathematica]] tips and tricks. | ||
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| + | == Position == | ||
| + | |||
| + | Often you want something like this: | ||
| + | |||
| + | <pre> | ||
| + | Position[mylist,#!=0&] | ||
| + | </pre> | ||
| + | |||
| + | which is not syntactically correct in Mathematica (this syntax works in Select[] for instance, but not in Cases[], to me it's a bit inconsistent). | ||
| + | |||
| + | The following almost works: | ||
| + | |||
| + | <pre> | ||
| + | Position[mylist,Expect[0]] | ||
| + | </pre> | ||
| + | |||
| + | but it finds the head of your list and apparently other things as well, so you get results like {0}. | ||
| + | |||
| + | It's better to process ''mylist'' directly: | ||
| + | |||
| + | <pre> | ||
| + | Position[#!=0&/@mylist,True] | ||
| + | </pre> | ||
== Progress bar == | == Progress bar == | ||
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ProgressIndicator[Dynamic[i], {imin, imax}] | ProgressIndicator[Dynamic[i], {imin, imax}] | ||
</pre> | </pre> | ||
| + | |||
| + | I don't know why it's called "ProgressIndicator" and not "ProgressBar". | ||
This is a list of Mathematica tips and tricks.
Often you want something like this:
Position[mylist,#!=0&]
which is not syntactically correct in Mathematica (this syntax works in Select[] for instance, but not in Cases[], to me it's a bit inconsistent).
The following almost works:
Position[mylist,Expect[0]]
but it finds the head of your list and apparently other things as well, so you get results like {0}.
It's better to process mylist directly:
Position[#!=0&/@mylist,True]
Use before any (long) loop over $i$:
ProgressIndicator[Dynamic[i], {imin, imax}]
I don't know why it's called "ProgressIndicator" and not "ProgressBar".