Function shift_operator_multivar 

pub fn shift_operator_multivar(
    r: usize,
    offset: i64,
    bc: BoundaryCondition,
    nvariables: usize,
    target_var: usize,
) -> Result<LinearOperator<TensorDynLen, usize>>

Create a shift operator for one variable in a multi-variable system.

Acts as shift on target_var and identity on all other variables. The resulting operator works on interleaved quantics encoding where each site has local dimension 2^nvariables.

Arguments

• r - Number of bits (sites)
• offset - Shift amount (can be negative)
• bc - Boundary condition
• nvariables - Total number of variables (must be at least 2)
• target_var - Which variable to shift (0-indexed, must be < nvariables)

Examples

use tensor4all_quanticstransform::{shift_operator_multivar, BoundaryCondition};

// Shift only the x-variable of a 2-variable function f(x, y) by 3
let op = shift_operator_multivar(4, 3, BoundaryCondition::Periodic, 2, 0).unwrap();
assert_eq!(op.mpo.node_count(), 4);