block_zero_based()

template<typename T , typename = require_all_kernel_expressions_and_none_scalar_t<T>>

auto stan::math::block_zero_based ( T &&  a, int  start_row, int  start_col, int  rows, int  cols  )

inline

Block of a kernel generator expression.

This version uses zero-based indices in contrast to the 1-based block(), which is exposed to the Stan language.

Block operation modifies how its argument is indexed. If a matrix is both an argument and result of such an operation (such as in block_zero_based(a, row1, col1, rows, cols) = block_zero_based(a, row2, col2, rows, cols); ), the result can be wrong due to aliasing. In such case the expression should be evaluating in a temporary by doing block_zero_based(a, row1, col1, rows, cols) = block_zero_based(a, row2, col2, rows, cols).eval();. This is not necessary if the blocks do not overlap or if they are the same block.

Template Parameters

T	type of argument

Parameters

a	input argument
start_row	first row of block
start_col	first column of a block
rows	number of rows in block
cols	number of columns in block

Returns

Block of given expression

Definition at line 340 of file block_zero_based.hpp.