Split vector A into smaller vectors based on vector B

I have two vectors of same lenght. Vector A contains angle data, and vector B contains gait phase (1=stand; 2=swing).

I want to split vector A into smallers vector for each individual gait phase.

My data is as follows:

Vector A Vector B

1.2 1

1.3 1

1.4 1

1.5 2

1.6 2

1.7 2

1.8 2

1.9 2

1.10 2

1.11 1

1.12 1

1.13 1

1.14 1

Then I want to split A into...

Vector C Vector D Vector E

1.2 1.5 1.11

1.3 1.6 1.12

1.4 1.7 1.13

1.8 1.14

1.9

1.10

Thank you!