detecting the difference of the sequence

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Chathu 2015-2-4

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评论： Chathu 2015-2-5

In the data set, i have one specific column which has 12 characters.It is a alphanumeric column.(pls see the attachment). Alphanumeric column sequence should be 0,1,2,3,....9,a,b,c,...f. But within the data set it differs(eg:3rd value in the file). I want to detect that value. (PS: since it has 12 characters, i want to first detect: first 4 characters(from the left) and if that's true then detect the last 4 digits). Any suggestions.

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Answer 1

Michael Haderlein 2015-2-4

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编辑：Michael Haderlein 2015-2-4

在 MATLAB Online 中打开

Why do you want to detect first 4 characters from the left and then the last 4 digits? My suggestion is:

fid=fopen('test.txt');
data=textscan(fid,'%s');
fclose(fid);
diff(cellfun(@hex2dec,data{1}))>1

This will always be false except of the step ...67 ...69

Edit: If you want to get the respective value which is too large:

 data{1}([false;diff(cellfun(@hex2dec,data{1}))>1])
 ans = 
    '03ff00000169'

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Michael Haderlein 2015-2-4

I don't understand the problem. Do you mean that after 03ff0000ffff the next value would be 040000000000? Or would the next value be 03ff00010000?

Maybe a short explanation about my code: I first convert all the data (e.g. 03ff00000169) from hexadecimal to decimal: hex2dec('03ff00000169')=4393751544169

Then, I check the difference of the values. If it's larger than 1 (i.e. at least one value is missing), the too large value will be displayed. In case 03ffffffffff is followed by 040e00000000 (instead of 040000000000), the difference is also >1 and the respective value will be displayed. Is that what you want?

Chathu 2015-2-5