How to assign negative values to a variable

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.

Can anyone answer for this. Thanks in advance.

[Yu Jiang]

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.

Answer 1

[Star Strider]

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

[vetri veeran]

Thank u sir.

[Star Strider]

My pleasure!

(Please Accept my Answer if it solved your problem.)

Answer 2

[Hikaru]

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.