Converting txt file string to matrix.

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Hannah Taylor 2020-3-31

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评论： Hannah Taylor 2020-3-31

I have an unhelpful txt file containing a string that looks something like:

{co-ordinates 1.5 2.5 4.8 weighting 11.7}{co-ordinates 2.5 2.8 1.7 weighting 21.4}{co-ordinates 1.5 2.5 4.8 weighting 11.7} .... etc

I'm trying to create a matrix with 4 collums (x co-ord, y co-ord, z co-ord, weighting) from this string. The co-ordinated are separated by a single space, the co-ords and weighting is separated by a double space.

Thanks in advance.

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KSSV 2020-3-31

Read about textscan.

Hannah Taylor 2020-3-31

Is this similar to sscanf? I've been looking into this but unsure how to go about the 'format spec' part to say e.g. 'read the number after 'co-ordiantes ''

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Answer 1

Stephen23 2020-3-31

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https://ww2.mathworks.cn/matlabcentral/answers/514249-converting-txt-file-string-to-matrix#answer_423078

编辑：Stephen23 2020-3-31

在 MATLAB Online 中打开

>> str = '{co-ordinates 1.5 2.5 4.8   weighting 11.7}{co-ordinates 2.5 2.8 1.7   weighting 21.4}{co-ordinates 1.5 2.5 4.8   weighting 11.7}';
>> mat = sscanf(str,'{co-ordinates%f%f%f weighting%f}',[4,Inf]).'
mat =
          1.5          2.5          4.8         11.7
          2.5          2.8          1.7         21.4
          1.5          2.5          4.8         11.7