I keep getting the error "Array indices must be positive integers or logical values?"

2019 12 6
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I have been editing a code I found that models a 2 cart system using Euler's Method in an attempt to make it a 3 cart system. However, on line 63 I am recieving an error that states "Array indices must be positive integers or logical values." I am not sure what this means or how to fix it. Any help would be apprecieted. Thanks!

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the cyclist
the cyclist 2019-12-6

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In expressions like this one
k2(x2(n,:)-x1(n,:))
MATLAB is trying to index into the variable k2. You need to put in the multiplication sign explicitly:
k2.*(x2(n,:)-x1(n,:))

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