writing equation in matlab

How to write the equation of image in matlab.

The parameters of the image are i->number of users; gamma is the normalized channel gain

Answer 1

[Walter Roberson]

r = @(i) omega * beta * log2(1 + P(i)*gamma(i) / sum( P(1:i-1) .* gamma(i) + omega) )

It is not entirely clear to me whether the omega is included in the summation term or not.

[Prabha Kumaresan]

I would like to check instead of sum whether symsum can be used for the expression below.

r = @(i) omega * beta * log2(1 + P(i)*gamma(i) / symsum( P(1:i-1) .* gamma(i) + omega) )

[Walter Roberson]

No. symsum() can never be used to index an array.

[Prabha Kumaresan]

ok

[jaah navi]

could you tell me what is the purpose of using @(i) at the beginning.whether it is necessary to use it.

[Walter Roberson]

No, if you were to put that line into a loop that had defined a particular value for i then you would not need the @(i) part. The @(i) part declares that r is to be an anonymous function that can be called with a particular i value to give the result -- but of course you could also just include the code in-line instead of in a function.

[jaah navi]

Ok. I have used that command in my code

P=sort(B)
G=sort(A,'descend')

for i =1:size(P,1)

r = @(i) Bmax*log2(1+(P(i).*G(i))/((sum(P(1:i-1)).*G(i))+noise))
end

If I run the code I am getting

r = 

      @(i)Bmax*log2(1+(P(i).*G(i))/((sum(P(1:i-1)).*G(i))+noise))

r = 

      @(i)Bmax*log2(1+(P(i).*G(i))/((sum(P(1:i-1)).*G(i))+noise))

r = 

      @(i)Bmax*log2(1+(P(i).*G(i))/((sum(P(1:i-1)).*G(i))+noise))

Could you please tell me how can the values of P and G matrix can be substituted in r.

[Walter Roberson]

P=sort(B)
G=sort(A,'descend')

for i =1:size(P,1)
  r(i) = Bmax*log2(1+(P(i).*G(i))/((sum(P(1:i-1)).*G(i))+noise))
end

Answer 2

[Kristopher Yaryan]

A particle moves with position function

s=t^4−4t^3−20t^3+20t,t≥0

a) At what time does the particle ha a velocity of 20 m/s?

b) At what time is the acceleration 0? What is the significance of this value t?

[Walter Roberson]

This is not an Answer to jaah navi's question. You should create your own Question. But first read Ask