How to climb stairs?

Question

Nerramus 2016-11-27

0
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https://ww2.mathworks.cn/matlabcentral/answers/314170-how-to-climb-stairs

回答： Nick 2016-11-27

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Hello everyone.

I am a begineer of MATLAB programming and I would like to get a circle climbing the stairs that are written as X and Y.

Here is the code so far:

clc 
clear
clf 
x=[0 0 29 29 58 58 87];
y=[0 0 0 17 17 34 34];
hbead  = line(x(1),y(1),'marker','o','markersize',10,'erase','none') ;
htrail = line(x(1),y(1),'marker','.','color','r','erase','none') ;
axis([-10 90 -5 40]);
axis('square');
for k = 1 : 7
      set(hbead ,'xdata',x(k),'ydata',y(k));
      set(htrail,'xdata',x(k),'ydata',y(k));
      drawnow
end

The circle does not move, nor the tail is drawn. The circle should move according to some equations, which describe how the circle moves when it in vertical or horizontal position, what heppens when the center of circle reaches the stair edge and so on. I guess, that these equations should be written in "for" cycle. Am I right?

Could you please help me to understand what do I do wrong?

Thank you.