Find all unique values and replace it with new values

I have a vector with values

v = [0.23; 0.1; 0.33; 0.23 ; 0.33; 0.6; 0.6; 0.4];

I would like to find the unique values and replace the vector with numbers from 1, like

newV = [1; 2; 3; 1 ; 3; 4; 4; 5];

Answer 1

[Walter Roberson]

findgroups()

But since you are using floating point numbers you really should use the third output of uniquetol() instead

[Elysi Cochin]

But since you are using floating point numbers you really should use the third output of uniquetol() instead

Sir, but why? unique and findgroups also give the result. What is the reason?

[Walter Roberson]

Are you 100% positive that the second 0.23 will be bit-for-bit identical to the first one? Are you assigning the initial value to an variable and then copying it to different locations in the array? Because if there is the slightest difference in how they are created, they might be different.

4.9/10 - 0.49 = 5.5511e-17

[Elysi Cochin]

okay sir will consider that

[Image Analyst]

@Elysi Cochin I'm pretty sure you've seen the FAQ on this before but here it is again:

https://matlab.fandom.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

Answer 2

[KSSV]

v = [0.23; 0.1; 0.33; 0.23 ; 0.33; 0.6; 0.6; 0.4];
[c,ia,newV] = unique(v,'stable') ;
newV

newV = 8×1

1 2 3 1 3 4 4 5

Answer 3

[Image Analyst]

Will this do:

v = [0.23; 0.1; 0.33; 0.23 ; 0.33; 0.6; 0.6; 0.4];
% newV = [1; 2; 3; 1 ; 3; 4; 4; 5];
[g, Tid] = findgroups(v)

g = 8×1

2 1 3 2 3 5 5 4

Tid = 5×1

0.1000 0.2300 0.3300 0.4000 0.6000

I know it doesn't match your desired but it's easy and maybe you don't need that exact order. If you need that exact order, can you explain why you need that order? (And don't jsut say I need it because I need it.)

[Elysi Cochin]

Order not important