Indexing parts of a string that occur in every x characters

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Zain 2022-6-20

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https://ww2.mathworks.cn/matlabcentral/answers/1744425-indexing-parts-of-a-string-that-occur-in-every-x-characters

评论： Walter Roberson 2022-6-21

I have a string of data that goes on for a while. I want to index a certain value that occurs after the same number of characters because of the way the data is set up. Here's the string:

'GRID*            5250001         5200000 0.730198500E+02-0.177000000E+03*       -0.512716000E+02         5200000               0               0GRID*            5250002         5200000 0.730198500E+02-0.176250000E+03*       -0.512716000E+02         5200000               0               0...'

Say I want to extract the value after it says 'GRID*' every time. I want to write something to start indexing at the 17th character, extract the following 8 characters, then repeat the same process again 144 characters later to get the value next to where it says 'GRID*' for the second time, all the way until the end of the string. I thought it would be simple indexing, but I can't figure it out. Thanks in advance!

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Answer 1

Walter Roberson 2022-6-20

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convert the string to char, reshape to 144 rows, extract row 17:17+8-1, all columns. You might want to transpose the result from columns to row.

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Zain 2022-6-20

I'm not sure this method will work since each data cell is separated by a different number of characters, although it doesn't look that way. Some are 8 characters long and some are 16 characters long

Walter Roberson 2022-6-21

If there is a fixed separation between GRID* then reshaping should work. Extract the maximum number of characters per entry, as columns, such as 17:17+16-1. Transpose, string() or cellstr() and post process to decide the proper size for each entry.

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