Extracting numbers from a G-code file

Hi!

I want to extract numerical values from a long g-code file of the form:

G1 X-57.028 Y-53.059 E15.60701 ; skirt

G1 X-55.885 Y-55.047 E15.67798 ; skirt

G1 X-54.132 Y-56.526 E15.74894 ; skirt

G1 X-51.980 Y-57.319 E15.81990 ; skirt

G1 X-50.875 Y-57.418 E15.85423 ; skirt

G1 E13.85423 F2400.00000 ; retract extruder 0

G92 E0 ; reset extrusion distance

G1 X-39.700 Y-39.700 F7800.000 ; move to first perimeter point

G1 E2.00000 F2400.00000 ; unretract extruder 0

G1 F1800

G1 X39.700 Y-39.700 E4.45673 ; perimeter

G1 X39.700 Y39.700 E6.91345 ; perimeter

G1 X-39.700 Y39.700 E9.37018 ; perimeter

G1 X-39.700 Y-39.625 E11.82459 ; perimeter

G1 X-39.075 Y-39.075 F7800.000 ;

e

Now, I want to extract only the X Y E values. I.e. for X-57.028 Y-53.059 E15.60701 i want : -57.028 -53.059 15.60701

I would also like to store this in individual coloums (namely X, Y and E) or a matrix that will store all these numerical vales.

Can anyone please suggest a solution ?

Thank you.

Answer 1

[Stephen23]

Simple use of one regular expression is all that you need to identify those X, Y, and E values:

str = fileread('test.txt');
rgx = sprintf('\\s+%c([+-]?\\d+\\.?\\d*)','XYE');
tkn = regexp(str,rgx,'tokens');
mat = str2double(vertcat(tkn{:}))

Gving:

mat =
      -57.028      -53.059       15.607
      -55.885      -55.047       15.678
      -54.132      -56.526       15.749
       -51.98      -57.319        15.82
      -50.875      -57.418       15.854
         39.7        -39.7       4.4567
         39.7         39.7       6.9135
        -39.7         39.7       9.3702
        -39.7      -39.625       11.825

[First Last]

wow thank you, that helps alot

Answer 2

[Bhaskar R]

I put all your given data as "gcodefile.txt" , hope help you this

matchWords = {'X','Y','E'};     % Your required letters data
fid = fopen('gcodefile.txt', 'r');  % Open file id to read
tline = fgetl(fid);         % Get line
counter = 1;
while ischar(tline)
    tline = fgetl(fid);
    if tline == -1
        return;
    end
    tline(strfind(tline, '-')) = [];   % Eliminate - after X,Y,E
    % Saerching three character data after X,Y,E and absent of the letter
    % indicated the Not a number
    for ii = 1:3
        [a,b]  = regexp(tline,'\d+(\.\d+)?');   % Regulor expression to find matchcase letter
        isfind = strfind(tline,matchWords{ii});
        if  ~isempty(isfind)
             strPos = find(a > isfind,1,'first');
            val = str2double(tline(a(strPos):b(strPos)));   % Get the value upto next character
        else
            val = NaN;  % if not found assign as NaN
        end
        tmparray(:, ii) = val;
    end
    Outputarray(counter,:) = tmparray;
    counter = counter + 1;
end
Outputarray % First column as X, Second Y, third E
fclose(fid); %Close fid

[Sagar Mehta]

Thank you Bhaskar!!

[Federico Paolucci]

Hi, could someone solve my problem? Graziee

extraction of external edges coordinates from g code files - MATLAB Answers - MATLAB Central (mathworks.com)