Plotting the R(n) and compute n

Help please im so lost

Let Rn denote the equivalent resistance of n resistors connected in parallel, each having resistance R for n = 1, 2, 3, etc. It can be shown that Rn is governed by the following recursive relation:

R(n+1) = R(n)R/R(n), where n = 1,2,3,... with R1 = R (a) Given R = 10kΩ, write a MATLAB program to plot Rn versus n for n = 1, 2, . . . , 100. (b) For a given R and a positive integer m, write a MATLAB function that utilizes the while loop to compute n such that Rn = 10−mR.

[James]

I got part a but Im stuck on part b

function [R] = func(m)

r = 10000;

while (m ~= 0)

    R = (10^(-m)*r);
    m = m - 1;

end

this is my code it keeps giving me the error and im not sure why EDU>> func(m) Undefined function or variable 'm'.

Answer 1

[Honglei Chen]

You need to pass in a number or define m first, for example

m = 3
func(m)

[James]

Thanks for the help but im still getting the same error where would you put the info that you provide in my code? Im probably over thinking this.