Reading numbers from alphanumeric strings in a cell matrix

2012 10 13
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Hi ppl, i am reading a text file consisting of various lines of alpha-numeric strings...
N010 G00 X0 Y0 Z0 N020 G01 X-10 Y10 Z-1 N030 G01 X20 Y40 Z-1 N040 G04 X3 Y3 Z10 M03
Now I need all numerical values of X, i.e. -10,20,3. The problem I am facing is that the strings are read from text file as 'cell' vector and i have to convert them to 'char' to use 'regexp' using '\w*X\w*'....this works, but does not allow the negative number to be read because it starts with a '-'. What to do now??? can anybody help?? I am using MATLAB 2010

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Matt Fig
Matt Fig 2012-10-13
What about the 0? You say you need the numeric values beside the X, but don't list zero...
shapes
shapes 2012-10-13
I'd like to carry the zero as well, but the actual numeric value is what I want to extract. And the thing is when the text file is read, it takes on line as an entity, so it is not ['N010' 'G01' 'X-10' 'Y20' 'Z5'] but ['N010 G01 X-10 Y20 Z5']...so first i break them into char, then parse but still the negative numbers are not read..
Matt Fig
Matt Fig 2012-10-13
See my comment on my answer below.

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Matt Fig
Matt Fig 2012-10-13

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X = {'N010' 'G00' 'X0' 'Y0' 'Z0' 'N020' 'G01'...
'X-10' 'Y10' 'Z-1' 'N030' 'G01' 'X20' 'Y40'...
'Z-1' 'N040' 'G04' 'X3' 'Y3' 'Z10' 'M03'};
N = cellfun(@str2double,regexp([X{:}],'(?<=X)-*\d+','match'))

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shapes
shapes 2012-10-13
thankyou for ur attention, i have a querry about ur proposed method...i have explained that in answer of your comment...please see that
Matt Fig
Matt Fig 2012-10-13
If you have:
X = ['N010 G00 X0 Y0 Z0 N020 G01 X-10 Y10',...
'Z-1 N030 G01 X20 Y40 Z-1 N040 G04 X3 Y3 Z10 M03']
Then simply use:
N = cellfun(@str2double,regexp(X,'(?<=X)-*\d+','match'))
shapes
shapes 2012-10-13
Thank you very much sir..I really appreciate it... this works, I am using it for my Y and Z values as well now and it is working. Thanks again!

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Azzi Abdelmalek
Azzi Abdelmalek 2012-10-13
编辑：Azzi Abdelmalek 2012-10-13

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A={'N010' 'G00' 'X0' 'Y0' 'Z0' 'N020' 'G01' 'X-10' 'Y10' 'Z-1' 'N030'}
y=cell2mat(cellfun(@(x) str2num(cell2mat(regexp(x,'-?[0-9]','match'))),A,'un',0))

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shapes
shapes 2012-10-13
thankyou for ur response...but there is this thing, the thing is when the text file is read, it takes one line as an entity, so it is not ['N010' 'G01' 'X-10' 'Y20' 'Z5'] but ['N010 G01 X-10 Y20 Z5']...so first i break them into char, then parse but still the negative numbers are not read..
Azzi Abdelmalek
Azzi Abdelmalek 2012-10-13
A={' N010 G00 X0 Y0 Z0 N020 G01 X-10 Y10 Z-1 N030 G01 X20 Y40 Z-1 N040 G04 X3 Y3 Z10 M03'}
y=regexp(x,'-?[0-9,.]','match')
out=cell2mat(cellfun(@(x) str2num(cell2mat(x)),y,'un',0))
shapes
shapes 2012-10-13
thanks again, the decimal is a little out of place but the problem is solved. Thanks again

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