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Type system

Supported types

Currently, supported basic types in Taichi are

  • int32 ti.i32
  • int64 ti.i64
  • float32 ti.f32
  • float64 ti.f64

Boolean types are represented using ti.i32.

Binary operations on different types will give you a promoted type, following the C programming language, e.g.

  • i32 + f32 = f32
  • f32 + f64 = f64
  • i32 + i64 = i64

Default precisions

By default, numerical literals have 32-bit precisions. For example, 42 has type ti.i32 and 3.14 has type ti.f32. Default precisions can be altered using

ti.get_runtime().set_default_fp(ti.f32)
ti.get_runtime().set_default_fp(ti.f64)

ti.get_runtime().set_default_ip(ti.i32)
ti.get_runtime().set_default_ip(ti.i64)

Type casts

Use ti.cast to type-cast scalar values.

a = 1.4
b = ti.cast(a, ti.i32)
c = ti.cast(b, ti.f32)

# Equivalently, use ``int()`` and ``float()``
#   to converting to default float-point/integer types
b = int(a)
c = float(b)

# Element-wise casts in matrices
mat = ti.Matrix([[3.0, 0.0], [0.3, 0.1]])
mat_int = mat.cast(int)
mat_int2 = mat.cast(ti.i32)