The same function behaves differently, why? - matlab

Question

I have this function below which works perfecttly as I need:
function [pointsQRS, pointsP, pointsT] = VCG (pointsQRS,pointsP,pointsT)
global ax1 ax2 h
figure('Name','Vektorkardiogram','NumberTitle','off','Color',[0.8 0.8 0.8])
%% first axes
ax1=subplot(1,2,1);
set(ax1,'Position',[0.1,0.2,0.3,0.7])
title('Vektorkardiogram')
hold on
grid on
axis vis3d
view([0 10])
plotCurve
mArrow3([1.5 2 -1],[-0.5, 2, -1], 'stemWidth',
0.005,'color','red','facealpha',0.3);
mArrow3([1.5 2 -1],[1.5, -0.5, -1], 'stemWidth',
0.005,'color','red','facealpha',0.3);
mArrow3([1.5 2 -1],[1.5, 2, 1], 'stemWidth',
0.005,'color','red','facealpha',0.3);
text(-0.5, 2, -1, 'Vx','FontSize',12);
text(1.5, -0.5, -1, 'Vy','FontSize',12);
text(1.5, 2, 1, 'Vz','FontSize',12);
%% second axes
ax2=subplot(1,2,2);
set(ax2,'Position',[0.6,0.2,0.3,0.7])
title('Vektorkardiogram')
hold on
grid on
axis vis3d
view([10 10])
plotCurve
function plotCurve
for i=2:size(pointsQRS,1)
if mod(i,2)==0
QRS=plot3(pointsQRS([i-1:i],1),pointsQRS([i-
1:i],2),pointsQRS([i-1:i],3),'-g','LineWidth',1);
else
plot3(pointsQRS([i-1:i],1),pointsQRS([i-
1:i],2),pointsQRS([i-1:i],3),'Color',[0 0 0],'LineWidth',1);
end
end
for i=2:size(pointsT,1)
if mod(i,2)==0
T=plot3(pointsT([i-1:i],1),pointsT([i-1:i],2),pointsT([i-
1:i],3),'-r','LineWidth',1);
else
plot3(pointsT([i-1:i],1),pointsT([i-1:i],2),pointsT([i-
1:i],3),'Color',[0 0 0],'LineWidth',1);
end
end
for i=2:size(pointsP,1)
if mod(i,2)==0
P=plot3(pointsP([i-1:i],1),pointsP([i-1:i],2),pointsP([i-
1:i],3),'-b','LineWidth',1);
else
plot3(pointsP([i-1:i],1),pointsP([i-1:i],2),pointsP([i-
1:i],3),'Color',[0 0 0],'LineWidth',1);
end
end
xlabel('Vx');ylabel('Vy');zlabel('Vz');
end
mArrow3([1.5 2 -1],[-0.5, 2, -1], 'stemWidth',
0.005,'color','red','facealpha',0.3);
mArrow3([1.5 2 -1],[1.5, -0.5, -1], 'stemWidth',
0.005,'color','red','facealpha',0.3);
mArrow3([1.5 2 -1],[1.5, 2, 1], 'stemWidth',
0.005,'color','red','facealpha',0.3);
text(-0.5, 2, -1, 'Vx','FontSize',12);
text(1.5, -0.5, -1, 'Vy','FontSize',12);
text(1.5, 2, 1, 'Vz','FontSize',12);
%% Slider Rotace
S = uicontrol('Style','slider',...
'Position',[10 10 300 20],...
'Max',180,...
'Min',-180,...
'Value',0,...
'SliderStep',[1/360 1/360]);
LS=addlistener(S,'ContinuousValueChange',#slider_callback);
set(S,'UserData',LS)
end
function slider_callback(hObject,eventData)
global ax1 ax2
val = get(hObject,'value');
view(ax1,[val,10])
view(ax2,[val+10,10])
end
But when I changed the code, simplified, because in other function I need only pointsT it gives me the error as in the picture.
The simplified code is:
function pointsT = VCG_T (pointsT)
global ax1_T ax2_T h_T
figure('Name','Vektorkardiogram','NumberTitle','off','Color',[0.8 0.8 0.8])
%% first axes
ax1_T=subplot(1,2,1);
set(ax1_T,'Position',[0.1,0.2,0.3,0.7])
title('Vektorkardiogram')
hold on
grid on
axis vis3d
view([0 10])
plotCurve
mArrow3([1.5 2 -1],[-0.5, 2, -1], 'stemWidth',
0.005,'color','red','facealpha',0.3);
mArrow3([1.5 2 -1],[1.5, -0.5, -1], 'stemWidth',
0.005,'color','red','facealpha',0.3);
mArrow3([1.5 2 -1],[1.5, 2, 1], 'stemWidth',
0.005,'color','red','facealpha',0.3);
text(-0.5, 2, -1, 'Vx','FontSize',12);
text(1.5, -0.5, -1, 'Vy','FontSize',12);
text(1.5, 2, 1, 'Vz','FontSize',12);
%% second axes
ax2_T=subplot(1,2,2);
set(ax2_T,'Position',[0.6,0.2,0.3,0.7])
title('Vektorkardiogram')
hold on
grid on
axis vis3d
view([10 10])
plotCurve
for i=2:size(pointsT,1)
if mod(i,2)==0
T=plot3(pointsT([i-1:i],1),pointsT([i-1:i],2),pointsT([i-
1:i],3),'-r','LineWidth',1);
else
plot3(pointsT([i-1:i],1),pointsT([i-1:i],2),pointsT([i-
1:i],3),'Color',[0 0 0],'LineWidth',1);
end
end
mArrow3([1.5 2 -1],[-0.5, 2, -1], 'stemWidth',
0.005,'color','red','facealpha',0.3);
mArrow3([1.5 2 -1],[1.5, -0.5, -1], 'stemWidth',
0.005,'color','red','facealpha',0.3);
mArrow3([1.5 2 -1],[1.5, 2, 1], 'stemWidth',
0.005,'color','red','facealpha',0.3);
text(-0.5, 2, -1, 'Vx','FontSize',12);
text(1.5, -0.5, -1, 'Vy','FontSize',12);
text(1.5, 2, 1, 'Vz','FontSize',12);
%% Slider Rotace
S = uicontrol('Style','slider',...
'Position',[10 10 300 20],...
'Max',180,...
'Min',-180,...
'Value',0,...
'SliderStep',[1/360 1/360]);
LS=addlistener(S,'ContinuousValueChange',#slider_callback);
set(S,'UserData',LS)
end
function slider_callback(hObject,eventData)
global ax1_T ax2_T
val = get(hObject,'value');
view(ax1_T,[val,10])
view(ax2_T,[val+10,10])
end
The picture of the error:
I have literally no idea why the simplified code doesn't work, probably I'm overlooking some thing.
Could you please give me a hint?
New problem below:

Answer 1

You have removed the line function plotCurve. This is an important one since it defines a local function that the main function VCG calls. In your reduced example this function does not exist anymore since you removed its header. That's why you see this error.
Just put it back (before the first loop), then it should work.