Relation between VIBGYOR and RGB

[trueblue_romeo]

is there a formula or relation that converts VIBGYOR to RGB ? i mean, in terms of RGB we can
say colors vary uniformly from black(0,0,0)to white(255,255,255). is there a similar uniform
way in which colors range from Violet to Red
(in terms of RGB)? the idea is to give it in a
for loop from violet to red. Please help.
Suggestions are also appreciated if you dont
have a code for this.

Thank you.
Suresh Babu.