May block() be used to write values?

[terrance savitsky]

Hi, I'm writing a function to create a block-diagonal matrix.   May one use block() to write values to a sub-block of a matrix?

Thank you,

Terrance

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Thank you, Terrance Savitsky

[Jonah Gabry]

Hi Terrance, 

We don't have R-style replacement functions (not sure if that's on Bob's long-term to-do list for the language or not), so you can't do something like 

block(A, ...) <- B;

However, recent versions of Stan do allow for much more flexibility with indexing (including for assignment), so I think you should be able to do things like 

A[i:j, k:l] <- B; // i,j,k,l integers
A[row_ids, col_ids] <- B; //row_ids, col_ids integer arrays

that weren't previously possible. Hope that helps, 

Jonah

[terrance savitsky]

Hi Jonah,  This is just what I needed.  Thanks for your help.   Terrance.

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