How can i fix Index exceeds the number of array elements (1) error

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James Chukwuemeka Agada
评论： Shreyas Taware 2021-4-27
Hi,
i downloaded this simple g-code reader earlier from the site to plot a set of g-codes that i have created on SolidCAM. However, everytime i run it, it keeps giving this error
Index exceeds the number of array elements (1).
Error in gCodeReader_3 (line 75)
if splitLine{i}(2) == 'X'
function toolPath = gCodeReader_3(filepath, dist_res, angle_res, plot_path, verbose)
%gCodeReader Function that takes a G-Code file and outputs the tool path
% for plotting/analysis. Not a complete analysis of the whole file, but
% more or less the basic motions.
% Inputs:
% - path to G-Code file
% - point spacing for linear motion (mm or inches, I guess)
% - point spacing for arc motion (degrees)
% - Plot the current path (1 or 0)
% - Output raw G-Code to console
% Outputs:
% - The interpolated tool path
% Notes:
% - This is not at all complete, but should work well enough for
% simple CNC G-Code. If you need anything more complex, I'd suggest
% you implement it yourself, as this was more or less all I needed
% at the time.
% - I have also done zero optimization.
% - This comes with no guarantees or warranties whatsoever, but I
% hope it's useful for someone.
%
% Example usage:
% toolpath = gCodeReader('simplePart.NC',0.5,0.5,1,0);
%
% Tom Williamson
% 18/06/2018
raw_gcode_file = fopen(filepath);
% Modes
Rapid_positioning = 0;
Linear_interpolation = 1;
CW_interpolation = 2;
CCW_interpolation = 3;
current_mode = NaN;
% Initialize variables
current_pos = [0,0,0];
toolPath = [];
arc_offsets = [0,0,0];
interp_pos = [];
while ~feof(raw_gcode_file)
tline = fgetl(raw_gcode_file);
% Check if its an instruction line
if tline(1) == 'N'
arc_offsets = [0,0,0];
tline = tline(6:end);
splitLine = strsplit(tline,' ');
for i = 1:length(splitLine)
if verbose == 1
disp(splitLine{i});
end
% Check what the command is (only the main ones are
% implemented i.e. G0 - G3)
if strcmp(splitLine{i}, 'G0')
if verbose == 1
disp('Rapid positioning')
end
current_mode = Rapid_positioning;
elseif strcmp(splitLine{i}, 'G1')
if verbose == 1
disp('Linear interpolation')
end
current_mode = Linear_interpolation;
elseif strcmp(splitLine{i}, 'G2')
if verbose == 1
disp('Circular interpolation, clockwise')
end
current_mode = CW_interpolation;
elseif strcmp(splitLine{i}, 'G3')
if verbose == 1
disp('Circular interpolation, counterclockwise')
end
current_mode = CCW_interpolation;
else
if splitLine{i}(2) == 'X'
current_pos(1) = str2num(splitLine{i}(2:end));
elseif splitLine{i}(2) == 'Y'
current_pos(2) = str2num(splitLine{i}(2:end));
elseif splitLine{i}(2) == 'Z'
current_pos(3) = str2num(splitLine{i}(2:end));
elseif splitLine{i}(2) == 'I'
arc_offsets(1) = str2num(splitLine{i}(2:end));
elseif splitLine{i}(2) == 'J'
arc_offsets(2) = str2num(splitLine{i}(2:end));
end
end
end
% Check the current mode and calculate the next points along the
% path: linear modes
if current_mode == Linear_interpolation || current_mode == Rapid_positioning
if length(toolPath > 0)
interp_pos = [linspace(toolPath(end,1),current_pos(1),100)',linspace(toolPath(end,2),current_pos(2),100)',linspace(toolPath(end,3),current_pos(3),100)'];
dist = norm((current_pos - toolPath(end,:)));
if dist > 0
dire = (current_pos - toolPath(end,:))/dist;
interp_pos = toolPath(end,:) + dire.*(0:dist_res:dist)';
interp_pos = [interp_pos;current_pos];
end
else
interp_pos = current_pos;
end
% Check the current mode and calculate the next points along the
% path: arc modes, note that this assumes the arc is in the X-Y
% axis only
elseif current_mode == CW_interpolation
center_pos = toolPath(end,:) + arc_offsets;
v1 = (toolPath(end,1:2)-center_pos(1:2));
v2 = (current_pos(1:2)-center_pos(1:2));
r = norm(current_pos(1:2)-center_pos(1:2));
angle_1 = atan2d(v1(2),v1(1));
angle_2 = atan2d(v2(2),v2(1));
if angle_2 > angle_1
angle_2 = angle_2-360;
end
interp_pos = [center_pos(1:2) + [cosd(angle_1:-angle_res:angle_2)',sind(angle_1:-angle_res:angle_2)']*r, linspace(center_pos(3),current_pos(3),length(angle_1:-angle_res:angle_2))'];
interp_pos = [interp_pos;current_pos];
elseif current_mode == CCW_interpolation
center_pos = toolPath(end,:) + arc_offsets;
v1 = (toolPath(end,1:2)-center_pos(1:2));
v2 = (current_pos(1:2)-center_pos(1:2));
r = norm(current_pos(1:2)-center_pos(1:2));
angle_1 = atan2d(v1(2),v1(1));
angle_2 = atan2d(v2(2),v2(1));
if norm(v1) <0.1
angle_1 = 0;
end
if norm(v2) <0.1
angle_2 = 0;
end
if angle_2 < angle_1
angle_2 = angle_2+360;
end
interp_pos = [center_pos(1:2) + [cosd(angle_1:angle_res:angle_2)',sind(angle_1:angle_res:angle_2)']*r, linspace(center_pos(3),current_pos(3),length(angle_1:angle_res:angle_2))'];
interp_pos = [interp_pos;current_pos];
end
toolPath = [toolPath;interp_pos];
end
end
% Plot if requested
if plot_path
plot3(toolPath(:,1),toolPath(:,2),toolPath(:,3),'b-')
end
fclose(raw_gcode_file);
end
Can someone please help, very new to MATLAB so i don't know what's wrong
I've attached the gcode file i trying to plot

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回答（1 个）

OKAN TOPCU
OKAN TOPCU 2021-2-4
I am very new to G Code files and i would like to learn how i can provide 'dist_res' and 'angle_res' values as input to the function. I am really confused. It would be really kind of you if you could help me.
  1 个评论
Shreyas Taware
Shreyas Taware 2021-4-27
angle_res is basically an angular step in the clockwise/ anticlockwise direction specified. If you notice variable 'dire' is a unit vector which is then multiplied by the distance that varies from 0 to d. If you go step-by-step, I think you should be able to get what the code is intending to say.

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