# How to assign negative values to a variable

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vetri veeran on 7 Aug 2014
Commented: Star Strider on 7 Aug 2014
I am getting an error as like this.
Subscript indices must either be real positive integers or logicals.
my code is,
V = -60
am(V)=(0.01*(V+50))/(1-exp(-(V+50)/10))
but i need to pass V=-60 to am(V). how can i pass this.
Yu Jiang on 7 Aug 2014
It would be more helpful if you could explain what objective you are trying to achieve. It seems like am(V) is a function of V and you would like to get the value of the function at V = -60. If that is the case, you may need to define the function first before passing a value into it.

Star Strider on 7 Aug 2014
Edited: Star Strider on 7 Aug 2014
Your ‘am’ function needs to be coded as an anonymous function:
V = -60
am = @(V) (0.01*(V+50))/(1-exp(-(V+50)/10));
amV = am(V)
produces:
amV =
58.1977e-003
##### 2 CommentsShowHide 1 older comment
Star Strider on 7 Aug 2014
My pleasure!

Hikaru on 7 Aug 2014
Edited: Hikaru on 7 Aug 2014
V = -60
am = (0.01*(V+50))/(1-exp(-(V+50)/10))
am(V) in MATLAB means that you want to access the V-th index in the array am, which has to be positive integers or logicals.

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