How to Read Data from one type of (.sema) file and to convert it into .txt file

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Sumit Saha 2020-12-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/694410-how-to-read-data-from-one-type-of-sema-file-and-to-convert-it-into-txt-file

编辑： Cris LaPierre 2021-1-6

I have 20000 (.sema) file and want to get .txt file from .sema file by excluding 1st column and first 11 rows. For example file name is acc_HXX_X_0_Y_0.

clear all

DATA_DIR = 'Desktop/subshear/subshear_acc/';

out_DIR = 'EQ/subshear/acc_files_subshear/';

x = [-30:5:30].*1e3;

y = [-30:5:30].*1e3;

[xx yy]=meshgrid(x,y);

nstat=length(xx);

nx = length(x);

ny = length(y);

kk=0;

for i=1:nx

for j=1:ny

kk=kk+1;

st_name=sprintf('X%dkY%dk',xx(kk)./1e3,yy(kk)./1e3);

filename = sprintf('%s/IND.%s.HXX.sema',DATA_DIR,st_name);

% fprintf(fid,'%s \t %s \t %f \t %f \t %f \t %f\n',st_name,'IND',yy(kk), xx(kk), 0.0, 0.0);

t_acc=load(filename,'r');

filename_acc = sprintf('%s/acc_%s.txt',out_DIR,st_name);

fid=fopen(filename_acc);

%fprintf(fid,'%g',t_acc(:,2));

%fclose(fid);

end

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采纳的回答

Cris LaPierre 2020-12-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/694410-how-to-read-data-from-one-type-of-sema-file-and-to-convert-it-into-txt-file#answer_576250

编辑：Cris LaPierre 2020-12-15

在 MATLAB Online 中打开

Quick inspection suggests that your files are just text files with a custom extension. At least I can open them in a text editor and read them just fine.

MATLAB does try to determine file properties based on the extension. That will not be possible with this extension. However, you can still import the data. You just need to set some settings manually.

The file you mention is not in the zip file you shared. The 5 files you share all are 800x2. Here's how I might do it:

data = readmatrix("IND.X0kY0k.HXX.sema","FileType","text","Range",[12 2])
data = 789×1    
              7.151661e-13
              2.853065e-12
             4.9193176e-12
            -3.5160106e-12
            -4.2815907e-11
            -1.1427437e-10
            -1.2858667e-10
              1.392735e-10
             8.8575636e-10
             1.7722569e-09