| index.tangram | R Documentation | 
Given a tangram class create an index representation.
## S3 method for class 'tangram' index(object, id = "tangram", key.len = 4, ...)
| object | The tangram for indexing | 
| id | an additional specifier for the object key | 
| key.len | numeric; length of keys generated (affects collision probability) | 
| ... | additional arguments to renderer. Unused | 
A matrix of strings containing key, source and value
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