Converting Alternative Scientific Notation to MATLAB

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Stephen Biel
Stephen Biel 2020-11-17
编辑： Stephen23 2020-11-18
I have a file with these example numbers I have imported as strings. I can't import as numbers because they come up as NaN.
-5.769-2
3.9984-2
4.568450
These are the 3 variations of numbers in the file
I want to convert these imported strings to MATLAB double, but I get NaN for the first 2 variations.
str2double('-5.769-2') = NaN
str2double('3.9984-2') = NaN
str2double('4.568450') = 4.568450
I want to get the following
-5.769-2 = -5.769e-2
3.9984-2 = 3.9984e-2
Thanks for your assistance.
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James Tursa
James Tursa 2020-11-17
You haven't answered my question about spacing. Are the numbers right next to each other, each in 8 columns exactly? Or ...? Can you post a sample of the lines? This would affect how people would answer your question.
Stephen Biel
Stephen Biel 2020-11-17
编辑：Stephen23 2020-11-18
Here is an example. The number data at the right of the row is 3 coordinate points that are 8 characters long. Thx.
GRID 15123 .272603922.913396.501789
GRID 15124 .334725822.913396.358268
GRID 15125 .281283322.913396.223329
GRID 15126 .148712722.913396.161716
GRID 15127 1.1008-222.913396.207708
GRID 15128 4.66672 22.9133910.39098
GRID 15129 4.71135 22.9133910.5398
GRID 15130 4.85003822.9133910.60985
GRID 15131 4.99701322.9133910.55691

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采纳的回答

Walter Roberson
Walter Roberson 2020-11-17
Ran in:
format long
S = {
'-5.769-2'
'3.9984-2'
'4.568450'
};
str2double(regexprep(S, '([-+]\d+)$', 'e$1'))
ans = 3×1
-0.057690000000000 0.039984000000000 4.568450000000000
●

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