How to Generate this Function?

if

input_x={1/6,1/6,1/6,1/6,1/6,1/6}

How can I generate this function:

i=1:6  
pi_all(i)=(1-(i-1)/5)*(0.45+1.1*(input_x(i)/2 +sum(input_x(i:i-1))))

[Walter Roberson]

Are you looking for a way to vectorize the expression?

Note that i:i-1 is empty in MATLAB.

[Torsten]

In sum(...), you refer to input_x(1:0). But input_x(0) does not exist in MATLAB language.

Best wishes

Torsten.

[pervesh anthwal]

then how can I write summation input_x(j) for j<i for this equation

[Torsten]

Which elements of input_x do you want to sum if you write

sum(input_x(i:i-1))

?

Best wishes

Torsten.

[Walter Roberson]

Torsten:

1:0 is not the same as [1, 0]. 1:0 is empty, so input_x(1:0) is the empty vector.

[Walter Roberson]

Why are you not using a loop and

sum(input_x(1:i-1))

Answer 1

[pervesh anthwal]

https://in.mathworks.com/matlabcentral/answers/375711-how-to-generate-this-function#comment_521727

what I want to do is:

for i=1

pi_all(i)=(1-(1-1)/5)*(0.45+1.1*(input_x(1)/2))

In this expression I want sum term to be 0 as i!=0

for i=2

pi_all(2)=(1-(2-1)/5)*(0.45+1.1*(input_x(2)/2 +sum(input_x(2:2-1))))

In here sum will take only input_x(1)

for i=3

pi_all(i)=(1-(3-1)/5)*(0.45+1.1*(input_x(3)/2 +sum(input_x(3:3-1))))

In here sum will take input_x(1)+input_x(2)

and so on.

[Walter Roberson]

If you are using a loop, then like I indicated,

sum(input_x(1:i-1))