While loop error, is not recognized

[renzosebs]

Hi, I am trying to make a code in Octave and I don't know why while statement
is not working, is not being recognized as a  block in the function. This is
an image of it, notice how the function is ending with the endwhile, and the
for loop is not in the function, however the for is made as a block, but
while is not. 
<http://octave.1599824.n4.nabble.com/file/t372838/Screenshot_20180427_225548.png>
 

If anyone can explain why this is happening, I will be vary grateful. 



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