Obtaining data from a text file
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I'm relatively new to MatLab, and I'm having trouble extracting a specific number from a text file. The text file reads as follows:
"Whatever=43
this is not it =3
start=2300"
What function do I use to return 2300 (and as a number format of some sort, like a double or a single, rather than a string)?
采纳的回答
I've attached the sample text file to run this demo. In the 3rd line of code, a regular expression is used to search for the row of text that contains the key word "start". If you have more than 1 row of text that contains that word, you'll need to adapt this.
% read file --> char array
content = fileread('textfile.txt');
% Break up each line of char array into cell of strings
contentStr = strsplit(content, '\n');
% Locate string that contains the key ("start")
target = contentStr{~cellfun(@isempty,regexp(contentStr, 'start'))};
% Isolate the numeric value
val = str2double(target(regexp(target, '=')+1 : end));
% val =
% 2300
5 个评论
Christian F
2019-3-27
编辑：Christian F
2019-3-27
Adam Danz
2019-3-27
I updated my code above. The original final line was
val = str2double(regexp(target, '\d+', 'match'));
but this wouldn't work if there were decimal values such as start = 2300.5;
Adam Danz
2019-3-27
In the first line of my code I create the variable 'content'. That variable is an input in the 2nd line. It looks like you're running the 2nd line without running the first line.
Christian F
2019-3-27
Adam Danz
2019-3-27
Great!
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