Timeline for question about using Heads->True in Cases command
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 22, 2017 at 12:17 | vote | accept | Nasser | ||
| Nov 22, 2017 at 10:29 | history | tweeted | twitter.com/StackMma/status/933281295823659014 | ||
| Nov 22, 2017 at 9:05 | history | edited | Alexey Popkov |
edited tags
|
|
| Nov 22, 2017 at 6:45 | answer | added | WReach | timeline score: 5 | |
| Nov 22, 2017 at 5:03 | comment | added | Nasser | @b3m2a1 Ok, but that is not what documentation says :). Mathematica helps sometimes is not really clear and very short in explaining things. | |
| Nov 22, 2017 at 5:01 | comment | added | b3m2a1 |
Nah, Heads->True makes it (try to) match the Head too. The docs were just noting that since it was matching the _Symbol, it was going to return the Head.
|
|
| Nov 22, 2017 at 5:00 | comment | added | Nasser |
@b3m2a1 thanks. I know this. But I do not see how this made Cases work. Help says that Head->True just makes Cases also return the Head in the result. So I would have expected something like {Derivative,1,2} to be returned.
|
|
| Nov 22, 2017 at 4:58 | comment | added | b3m2a1 |
y''[x] // FullForm gives Derivative[2][y][x]. That Derivative term is in the Head. You'll could get away with Heads->False here by doing Derivative[n_][_][__], but note that this may not work in general.
|
|
| Nov 22, 2017 at 4:03 | history | asked | Nasser | CC BY-SA 3.0 |