Function with for loop doesn't always work

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Daniel
Daniel 2024-4-21
评论： Voss 2024-4-22
I've written a function that writes a C structure into a header file using fprintf(). It seems to not work at all when the input array is small and works partially when the input array is big.
function deg = path2header(fid, deg, comment, option)
% Print path into a header file
% The angle can be set as 'rad', 'deg', or 'rev' in the option.
% fid - File indentity
% deg - [deg, vmax, amax, dwell]
% comment - Name of the path
% option - 'rad', 'deg', or 'rev'
if strcmp(option,'rad')
deg = deg./(2*pi);
elseif strcmp(option,'deg')
deg = deg./360;
elseif strcmp(option,'rev')
else
disp("Error option in path2header()")
return
end
[nseg,m]=size(deg);
disp(nseg)
fprintf(fid,'//---%s\n', comment);
fprintf(fid,'//---%s\n', datestr(now,0));
fprintf(fid,' char headerTime[] = "%s";\n',datestr(now,0));
fprintf(fid,' int nseg = %d; // number of points\n',nseg);
fprintf(fid,' seg\tmySegs[%d]={ // define the array of points in revs\n',nseg);
for i = 1:nseg-1
fprintf(fid,' {');
for j = [1,2,3]
fprintf(fid,'%e, ',deg(i,j));
end
fprintf(fid,'%e},\n',deg(i,4));
end
fprintf(fid,' {');
for j = [1,2,3]
fprintf(fid,'%e, ',deg(nseg,j));
end
fprintf(fid,'%e},\n',deg(nseg,4));
fprintf(fid,'}\n };\n');
This is an example of the test code that results in an empty testPath.h file.
clear;
deg = [ones(3,3), zeros(3,1)];
HeaderFileName = "testPath.h";
fid = fopen(HeaderFileName,'W');
comment = "matlab sramp";
path2header(fid, deg, comment, 'rev')
The function is part of a bigger script to convert angles from an inverse kinematics equation to be saved as C header file to preprogram a motor's path thus the n x 4 matrix.
Please help. Thx!
  1 个评论
Dyuman Joshi
Dyuman Joshi 2024-4-21
How does it "not work"? Please specify in the context of your question.
Is the spacing inconsistent?

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回答（2 个）

VBBV
VBBV 2024-4-21
Ran in:
With option as rev, it wont work, since the variable deg is undefined
option = 'rev' % with this option it wont
option = 'rev'
if strcmp(option,'rad')
deg = deg./(2*pi);
elseif strcmp(option,'deg')
deg = deg./360;
elseif strcmp(option,'rev')
else
disp("Error option in path2header()")
return
end
[nseg,m]=size(deg)
Unrecognized function or variable 'deg'.
  3 个评论
显示 1更早的评论
VBBV
VBBV 2024-4-22
编辑：VBBV 2024-4-22
If the function is part of bigger script, maybe the fid has changed as result of operations, you can close the open file after every call to function as
lear;
deg = [ones(3,3), zeros(3,1)];
HeaderFileName = "testPath.h";
fid = fopen(HeaderFileName,'W');
comment = "matlab sramp";
if fid == -1
disp('error message')
else
path2header(fid, deg, comment, 'rev')
fclose(fid) % add this line
end
Voss
Voss 2024-4-22
编辑：Voss 2024-4-22 
deg = deg;

is not necessary.

If option is 'rev', then deg will be as passed in to the function - no need to assign it to itself.

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Voss
Voss 2024-4-22
fclose the file, and you'll see it's not empty.
  2 个评论
Daniel
Daniel 2024-4-22
Ah yes, that's the fix. I should've noticed this if I wasn't writing the script late at night while extremely tired. Thank you!

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