Error in extract_db (line 47) file_a = extractAft​er(char(fi​le_a), 0, strfind(char(file_a), '_')-2);

'101_1.tif'	'101_2.tif'	'101_3.tif'	'101_4.tif'	'101_5.tif'	'101_6.tif'	'101_7.tif'	'101_8.tif'	'102_1.tif'	'102_2.tif'	'102_3.tif'	'102_4.tif'	'102_5.tif'	'102_6.tif'	'102_7.tif'	'102_8.tif'	'103_1.tif'	'103_2.tif'	'103_3.tif'	'103_4.tif'	'103_5.tif'	'103_6.tif'	'103_7.tif'	'103_8.tif'	'104_1.tif'	'104_2.tif'	'104_3.tif'	'104_4.tif'	'104_5.tif'	'104_6.tif'	'104_7.tif'	'104_8.tif'	'105_1.tif'	'105_2.tif'	'105_3.tif'	'105_4.tif'	'105_5.tif'	'105_6.tif'	'105_7.tif'	'105_8.tif'	'106_1.tif'	'106_2.tif'	'106_3.tif'	'106_4.tif'	'106_5.tif'	'106_6.tif'	'106_7.tif'	'106_8.tif'	'107_1.tif'	'107_2.tif'	'107_3.tif'	'107_4.tif'	'107_5.tif'	'107_6.tif'	'107_7.tif'	'107_8.tif'	'108_1.tif'	'108_2.tif'	'108_3.tif'	'108_4.tif'	'108_5.tif'	'108_6.tif'	'108_7.tif'	'108_8.tif'	'109_1.tif'	'109_2.tif'	'109_3.tif'	'109_4.tif'	'109_5.tif'	'109_6.tif'	'109_7.tif'	'109_8.tif'	'110_1.tif'	'110_2.tif'	'110_3.tif'	'110_4.tif'	'110_5.tif'	'110_6.tif'	'110_7.tif'	'110_8.tif'

I have the Img names "101_1",
and I want to extract the substring
included between the underscore '_'. 
Here I used,

 file_a = extractAfter(char(file_a), 0, strfind(char(file_a), '_')-2);
 
but it produces error,
I want as output 102_1 and so on.
How can I do this? thanks

Answer 1

[Walter Roberson]

fileparts()

You do not indicate what the error is .I suspect you are using r2016a or earlier before extractAfter existed

[Balaji M. Sontakke]

Error using extractAfter

Too many input arguments.

Error in extract_db (line 47)

file_a = extractAfter(char(file_a), 0, strfind(char(file_a), '_')-2);

i am using r2016a matlab

[Walter Roberson]

extractAfter did not exist in your release so you are invoking some other routine that happens to have the same name .

[Balaji M. Sontakke]

Atleast give some hint todo following statement

char(file_a), 0, strfind(char(file_a), '_')-2

myprogram executes file 101_1 to 101_8 but when loop comes on 102_1 am getting above

error, how to execute

char(file_a), 0, strfind(char(file_a), '_')-2

in r2016a release.

[Walter Roberson]

I gave the hint already . fileparts()

[Walter Roberson]

file_a = regexprep(file_a, '\..*$', '');

This will work whether file_a is a cell array of character vectors or a single character vector -- in other words it can be applied to the complete list of filenames all at the same time.

[Balaji M. Sontakke]

It works, Thanks a lot