Multi Condition While Loop (w/ multiple conditions within same variable)

Question

Here's the basic setup. I am trying to create a while loop that will iterate until a set condition is below a certain tolerance. However, this loop must be generalized for multiple values within the same matrix. An example (simplified from what I'm currently trying to accomplish):

x = [3; 2]
tolerance = [0,0]
iter = 0
while x > tolerance
x = x - 1;
iter = iter + 1;
end

The issue I am facing is that the while loop will exit as soon as 1 of the values in the function is less than the tolerance. What I intend to occur is that the while loop will continue to iterate on both variables until both are below the desired tolerance. I am unable to have two separate loops because the size of the variable I will be iterating upon is not set at 2 values.

Any kind of help would be greatly appreciated.

tmpearce · Accepted Answer · 2016-10-22 18:02:07Z

2

Matlab has a couple of related functions, any and all that help with this kind of thing.

any, which returns true if any of the elements are truthy, will help you here:

while any(x>tolerance)
   ...
end

You can also do other tricks like

while sum(x>tolerance) > 0

to achieve the same thing, but I like how semantically clear any is.

answered Oct 22, 2016 at 18:02

tmpearce

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