Split a char without spaces and arbitrarily characters

Question

Michael Eissler 2022-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/1852508-split-a-char-without-spaces-and-arbitrarily-characters

评论： Michael Eissler 2022-11-16

Hello together,

I need your help to split my text. As you can see, I have a char with the name "text" (in my project i will read this row from a textfile).

Now I have to split this row into 13 parts. Sometimes a space is in between, sometimes not. I have problems to split the parts, when exponential notation is given together.

My consideration was to split the text with strsplit after each space AND after the character "E***". The * stands for any characters after the E.

For example, the first 4 cells should be like this: 17575 3.10705E+00 -7.07230E+01 -1.77433E-01.

Thansk for your help!

Mcihael

text = sprintf('    17575  3.10705E+00-7.07230E+01-1.77433E-01-2.72479E-05-7.19082E-06-9.65426E-06 1.70247E-04 4.89104E-05 3.56048E-05 3.71071E+01-3.38230E+01-1.77433E-01');

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Answer 1

Stephen23 2022-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/1852508-split-a-char-without-spaces-and-arbitrarily-characters#answer_1101428

编辑：Stephen23 2022-11-16

在 MATLAB Online 中打开

format long G
txt = '    17575  3.10705E+00-7.07230E+01-1.77433E-01-2.72479E-05-7.19082E-06-9.65426E-06 1.70247E-04 4.89104E-05 3.56048E-05 3.71071E+01-3.38230E+01-1.77433E-01';
vec = sscanf(txt,'%f') % the simplest and most efficient approach is to convert to numeric
vec = 13×1
1.0e+00 *

                     17575
                   3.10705
                   -70.723
                 -0.177433
              -2.72479e-05
              -7.19082e-06
              -9.65426e-06
               0.000170247
               4.89104e-05
               3.56048e-05
rgx = '\s*[-+]?\d+\.?\d*(E[-+]\d+)?';
spl = regexp(txt,rgx,'match') % if you really want to fiddle around with text
spl = 1×13 cell array
    {'    17575'}    {'  3.10705E+00'}    {'-7.07230E+01'}    {'-1.77433E-01'}    {'-2.72479E-05'}    {'-7.19082E-06'}    {'-9.65426E-06'}    {' 1.70247E-04'}    {' 4.89104E-05'}    {' 3.56048E-05'}    {' 3.71071E+01'}    {'-3.38230E+01'}    {'-1.77433E-01'}