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Figure changes during export

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Nathan Hogaboom
Nathan Hogaboom 2024-8-6，17:54
评论： Nathan Hogaboom 2024-8-7，16:32
Hello everyone. I have created a loop where my function would save a plot of a series of posterior tangents overlaying vertebrae of the cervical spine. The problem is, after my function runs (code displayed below) only 5 out of the 6 lines appear on the plot. If I run it in isolation in the command window, all 6 lines appear. I have attached the images, the plot pre export with all 6 lines (ran in command window) and post export with the incorrect number (run as a function). I have gone through a number of times and cannot figure out why one line disappears when exporting. Any ideas?
Thanks in advance.
PS I have commented out parts of the code that are not relevant for this question. I did not delete so you were not confused about the input/output variables of my function.
function [c1_c7_angle,c2_c7_angle,c2c3_tangent,c3c4_tangent,c4c5_tangent,c5c6_tangent,c6c7_tangent]=rotation_angles(c1x,c1y,c2x,c2y,c3x,c3y,c4x,c4y,c5x,c5y,c6x,c6y,c7x,c7y,new_filename,i2)
%define posterior corners.
c2post=[c2x(1) c2y(1); c2x(4) c2y(4)];
c3post=[c3x(1) c3y(1); c3x(4) c3y(4)];
c4post=[c4x(1) c4y(1); c4x(4) c4y(4)];
c5post=[c5x(1) c5y(1); c5x(4) c5y(4)];
c6post=[c6x(1) c6y(1); c6x(4) c6y(4)];
c7post=[c7x(1) c7y(1); c7x(4) c7y(4)];
%c2_angle=rad2deg(atan((c2post(2,2)-c2post(1,2))/(c2post(2,1)-c2post(1,1))));
%c3_angle=rad2deg(atan((c3post(2,2)-c3post(1,2))/(c3post(2,1)-c3post(1,1))));
%c4_angle=rad2deg(atan((c4post(2,2)-c4post(1,2))/(c4post(2,1)-c4post(1,1))));
%c5_angle=rad2deg(atan((c5post(2,2)-c5post(1,2))/(c5post(2,1)-c5post(1,1))));
%c6_angle=rad2deg(atan((c6post(2,2)-c6post(1,2))/(c6post(2,1)-c6post(1,1))));
%c7_angle=rad2deg(atan((c7post(2,2)-c7post(1,2))/(c7post(2,1)-c7post(1,1))));
%c2c3_tangent=c2_angle-c3_angle;
%c3c4_tangent=c3_angle-c4_angle;
%c4c5_tangent=c4_angle-c5_angle;
%c5c6_tangent=c5_angle-c6_angle;
%c6c7_tangent=c6_angle-c7_angle;
%calculate c21-c7 angle by defining angle of inferior vertebral points.
%c1_angle=rad2deg(atan((c1y(1)-c1y(2))/(c1x(2)-c1x(1))));
%c2_inf_ang=rad2deg(atan((c2y(3)-c2y(4))/(c2x(3)-c2x(4))));
%c7_inf_ang=rad2deg(atan((c7y(3)-c7y(4))/(c7x(3)-c7x(4))));
%c1_c7_angle=c7_inf_ang-c1_angle;
%c2_c7_angle=c7_inf_ang-c2_inf_ang;
vertebra_matrix=[c2post;c3post;c4post;c5post;c6post;c7post];
post_x=[c2x(1) c2x(4) c3x(1) c3x(4) c4x(1) c4x(4) c5x(1) c5x(4) c6x(1) c6x(4) c7x(1) c7x(4)];
post_y=[c2y(1) c2y(4) c3y(1) c3y(4) c4y(1) c4y(4) c5y(1) c5y(4) c6y(1) c6y(4) c7y(1) c7y(4)];
theta=zeros([1 6]);
x_diff=zeros([1 6]);
y_diff=zeros([1 6]);
V=zeros([6 2]);
factor_distance=2;
imshow(i2,'InitialMagnification',100);
hold on;
for h=1:6
f=h*2;
d=f-1;
x_diff(h)=post_x(d)-post_x(f);
y_diff(h)=post_y(f)-post_y(d);
theta(h)=rad2deg(atan(y_diff/x_diff));
V(h,:)=vertebra_matrix(d,:)-vertebra_matrix(f,:);
pext(h,:)=vertebra_matrix(h,:)+V(h,:)*factor_distance;
ax=gca;
output_filename=sprintf('%s_rotation.tif',new_filename);
exportgraphics(ax,output_filename);
plot([post_x(f),pext(h,1)],[post_y(f),pext(h,2)],'r-')
end
end

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采纳的回答

dpb
dpb 2024-8-6，18:36
移动：dpb 2024-8-6，18:36
exportgraphics(ax,output_filename);
plot([post_x(f),pext(h,1)],[post_y(f),pext(h,2)],'r-')
The exportgraphics call is before the call to plot() so the last one hasn't yet been plotted...when the loop finishes at the command line, then the line shows on the image--but that last image isn't exported.
Reverse the order of those two lines and joy should/will ensue...
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dpb
dpb 2024-8-6，21:11
编辑：dpb 2024-8-7，16:28
OBTW, it would be more efficient to move the line
exportgraphics(ax,output_filename);
outside after the loop; no sense in rewriting the same file six times...one piece at a time; the final plot is the only one you're really interested in.

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