How to scalean array of data so that the first value is 1

Good evening all!!

For an assignment I am given an array of data that Imust "scale so the first value is zero"

I tried using:

arrayn=normalize(array,'norm',1);

but got the error:

Undefined function 'normalize' for input arguments of type 'double'.

I feel like i am missing something obvious. Why wouldn't the normalize function work on doubles? do i have to convert the whole array?

Thank you

Answer 1

[Walter Roberson]

https://www.mathworks.com/help/matlab/ref/double.normalize.html

normalize() is R2018a or later and you are using R2017b. For releases before that you can use mat2gray()

However I suspect you are intended to write the equivalent code yourself.