Matlab if statements in physics

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Momo
Momo 2018-10-18
评论： Momo 2018-10-19
What does the condition mean in Matlab, where x and y are the displacement that measures from [-1,1]
if (abs(x)>=1)
x=sign(x);
end
if (abs(y)>=1)
y=sign(y);
end
  2 个评论
Walter Roberson
Walter Roberson 2018-10-18
The code is checking to see if the values are out of range and if so moving them to the boundary.
Momo
Momo 2018-10-19
you mean x and y will equal 1 or -1 if their values are out of the range? as Mr. James said,right?

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James Tursa
James Tursa 2018-10-18
编辑：James Tursa 2018-10-18
You can easily run the code to see that it clips the values outside of [-1,1] so that they stay in this range. But it appears there is a typo in the y code. This line
x=sign(y);
should probably be this instead (note the y on the lhs)
y = sign(y);
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James Tursa
James Tursa 2018-10-18
If x > 1, it will assign x = 1
If x <-1, it will assign x = -1
If x is between -1 and 1, it will leave x unchanged.
Same for y (as long as you fix the typo)

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