Reading selected data from .dat file

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Noah Thibodeaux
Noah Thibodeaux 2016-5-7
回答： Star Strider 2016-5-7
Hello,
I'm trying to extract data from a .dat file in a particular way. Basically, I need my program to take points from the first part of the data file...
1 8 12 13 14 9 3 2
3 9 14 15 16 10 5 4
.... (and so on)
and select data from the next part of the file corresponding to the numbers above as an "index."
2.0000 0
1.9829 0.1305
1.9319 0.2588
1.7321 0.5000
1.4142 0.7071
0.7654 0.9239
0.0000 1.0000
2.2000 0
As a for instance,
The first line of my file starts with "1 8 12 13..." I need to get coordinates:
2.0000 0
2.2000 0
.. and so on (coordinates corresponding to lines 12 and 13 and on..)
Just imagine it indexed like so,
1. 2.0000 0
2. 1.9829 0.1305
3. 1.9319 0.2588
4. 1.7321 0.5000
5. 1.4142 0.7071
6. 0.7654 0.9239
7. 0.0000 1.0000
8. 2.2000 0
If there is a more efficient way to perform this, please share!

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回答（1 个）

Star Strider
Star Strider 2016-5-7
Use the ‘First Part’ as indices into the ‘Second Part’.
For example:
FirstPart = [1 8 12 13 14 9 3 2];
NextPart = [2.0000 0
1.9829 0.1305
1.9319 0.2588
1.7321 0.5000
1.4142 0.7071
0.7654 0.9239
0.0000 1.0000
2.2000 0];
Result = NextPart(FirstPart(1:2),:)
Result =
2.0000 0.0000
2.2000 0.0000
Use all of ‘FirstPart’ in your code. I just used ‘FirstPart(1:2)’ because that’s all we have to work with.

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