New matrix representation. Add col and row iterators to Zig matrix example.
This commit is contained in:
parent
e72623880d
commit
e1883ac2e5
@ -1,23 +1,70 @@
|
||||
const std = @import("std");
|
||||
|
||||
const MatrixOpError = error{
|
||||
IncompatibleSizes,
|
||||
IncompatibleDims,
|
||||
OutOfBounds,
|
||||
};
|
||||
|
||||
const Matrix = struct {
|
||||
allocator: std.mem.Allocator,
|
||||
numbers: []i64,
|
||||
dimensions: []const u64,
|
||||
const RowIterator = struct {
|
||||
matrix: Matrix,
|
||||
rowIdx: u64,
|
||||
nextColIdx: u64,
|
||||
|
||||
pub fn init(allocator: std.mem.Allocator, dimensions: []const u64, init_numbers: []const i64) !Matrix {
|
||||
var size: u64 = 1;
|
||||
|
||||
for (dimensions) |dim| {
|
||||
size *= dim;
|
||||
pub fn init(matrix: Matrix, rowIdx: u64) RowIterator {
|
||||
return RowIterator{
|
||||
.matrix = matrix,
|
||||
.rowIdx = rowIdx,
|
||||
.nextColIdx = 0,
|
||||
};
|
||||
}
|
||||
|
||||
var numbers = try allocator.alloc(i64, size);
|
||||
pub fn next(self: *RowIterator) ?i64 {
|
||||
if (self.nextColIdx == self.matrix.cols) {
|
||||
return null;
|
||||
}
|
||||
|
||||
const nextValue = self.matrix.get(.{ self.rowIdx, self.nextColIdx }) catch unreachable;
|
||||
|
||||
self.nextColIdx += 1;
|
||||
|
||||
return nextValue;
|
||||
}
|
||||
};
|
||||
|
||||
const ColIterator = struct {
|
||||
matrix: Matrix,
|
||||
colIdx: u64,
|
||||
nextRowIdx: u64,
|
||||
|
||||
pub fn init(matrix: Matrix, rowIdx: u64) ColIterator {
|
||||
return ColIterator{
|
||||
.matrix = matrix,
|
||||
.colIdx = rowIdx,
|
||||
.nextRowIdx = 0,
|
||||
};
|
||||
}
|
||||
|
||||
pub fn next(self: *ColIterator) ?i64 {
|
||||
if (self.nextRowIdx == self.matrix.rows) {
|
||||
return null;
|
||||
}
|
||||
|
||||
const nextValue = self.matrix.get(.{ self.nextRowIdx, self.colIdx }) catch unreachable;
|
||||
|
||||
self.nextRowIdx += 1;
|
||||
|
||||
return nextValue;
|
||||
}
|
||||
};
|
||||
|
||||
allocator: std.mem.Allocator,
|
||||
numbers: []i64,
|
||||
rows: u64,
|
||||
cols: u64,
|
||||
|
||||
pub fn init(allocator: std.mem.Allocator, rows: u64, cols: u64, init_numbers: []const i64) !Matrix {
|
||||
var numbers = try allocator.alloc(i64, rows * cols);
|
||||
|
||||
for (0.., init_numbers) |i, num| {
|
||||
numbers[i] = num;
|
||||
@ -26,23 +73,16 @@ const Matrix = struct {
|
||||
return Matrix{
|
||||
.allocator = allocator,
|
||||
.numbers = numbers,
|
||||
.dimensions = dimensions,
|
||||
.rows = rows,
|
||||
.cols = cols,
|
||||
};
|
||||
}
|
||||
|
||||
fn position_deep_to_flat(self: Matrix, position: []const u64) u64 {
|
||||
var flat_position: u64 = 0;
|
||||
var curr_volume: u64 = 1;
|
||||
|
||||
for (0.., position) |i, pos| {
|
||||
flat_position += pos * curr_volume;
|
||||
curr_volume *= self.dimensions[i];
|
||||
fn position_deep_to_flat(self: Matrix, position: [2]u64) u64 {
|
||||
return position[0] * self.cols + position[1];
|
||||
}
|
||||
|
||||
return flat_position;
|
||||
}
|
||||
|
||||
pub fn get(self: Matrix, position: []const u64) !i64 {
|
||||
pub fn get(self: Matrix, position: [2]u64) !i64 {
|
||||
const flat_position = position_deep_to_flat(self, position);
|
||||
|
||||
if (flat_position >= self.numbers.len) {
|
||||
@ -52,7 +92,7 @@ const Matrix = struct {
|
||||
return self.numbers[flat_position];
|
||||
}
|
||||
|
||||
pub fn set(self: Matrix, position: []const u64, value: i64) !void {
|
||||
pub fn set(self: Matrix, position: [2]u64, value: i64) !void {
|
||||
const flat_position = position_deep_to_flat(self, position);
|
||||
|
||||
if (flat_position >= self.numbers.len) {
|
||||
@ -71,17 +111,18 @@ const Matrix = struct {
|
||||
}
|
||||
|
||||
pub fn add(self: Matrix, allocator: std.mem.Allocator, other: Matrix) !Matrix {
|
||||
if (!std.mem.eql(u64, self.dimensions, other.dimensions)) {
|
||||
if (self.rows != other.rows or self.cols != other.cols) {
|
||||
return error.IncompatibleSizes;
|
||||
}
|
||||
|
||||
var result: Matrix = try Matrix.init(
|
||||
allocator,
|
||||
self.dimensions,
|
||||
self.rows,
|
||||
self.cols,
|
||||
self.numbers,
|
||||
);
|
||||
|
||||
for (other.numbers, 0..) |num, idx| {
|
||||
for (0.., other.numbers) |idx, num| {
|
||||
result.numbers[idx] += num;
|
||||
}
|
||||
|
||||
@ -89,17 +130,18 @@ const Matrix = struct {
|
||||
}
|
||||
|
||||
pub fn sub(self: Matrix, allocator: std.mem.Allocator, other: Matrix) !Matrix {
|
||||
if (!std.mem.eql(u64, self.dimensions, other.dimensions)) {
|
||||
if (self.rows != other.rows or self.cols != other.cols) {
|
||||
return error.IncompatibleSizes;
|
||||
}
|
||||
|
||||
var result: Matrix = try Matrix.init(
|
||||
allocator,
|
||||
self.dimensions,
|
||||
self.rows,
|
||||
self.cols,
|
||||
self.numbers,
|
||||
);
|
||||
|
||||
for (other.numbers, 0..) |num, idx| {
|
||||
for (0.., other.numbers) |idx, num| {
|
||||
result.numbers[idx] -= num;
|
||||
}
|
||||
|
||||
@ -109,7 +151,8 @@ const Matrix = struct {
|
||||
pub fn neg(self: Matrix, allocator: std.mem.Allocator) !Matrix {
|
||||
var result: Matrix = try Matrix.init(
|
||||
allocator,
|
||||
self.dimensions,
|
||||
self.rows,
|
||||
self.cols,
|
||||
self.numbers,
|
||||
);
|
||||
|
||||
@ -120,6 +163,20 @@ const Matrix = struct {
|
||||
return result;
|
||||
}
|
||||
|
||||
pub fn row(self: Matrix, rowIdx: u64) RowIterator {
|
||||
return RowIterator.init(
|
||||
self,
|
||||
rowIdx,
|
||||
);
|
||||
}
|
||||
|
||||
pub fn col(self: Matrix, colIdx: u64) ColIterator {
|
||||
return ColIterator.init(
|
||||
self,
|
||||
colIdx,
|
||||
);
|
||||
}
|
||||
|
||||
pub fn deinit(self: Matrix) void {
|
||||
self.allocator.free(self.numbers);
|
||||
}
|
||||
@ -136,51 +193,34 @@ pub fn main() void {
|
||||
}
|
||||
|
||||
test "matrix init" {
|
||||
const mat = try Matrix.init(std.testing.allocator, &.{ 5, 5 }, &.{});
|
||||
const mat = try Matrix.init(std.testing.allocator, 5, 5, &.{});
|
||||
defer mat.deinit();
|
||||
|
||||
try std.testing.expect(mat.numbers.len == 25);
|
||||
}
|
||||
|
||||
test "matrix get 2 dim" {
|
||||
test "matrix get" {
|
||||
const mat = try Matrix.init(
|
||||
std.testing.allocator,
|
||||
&.{ 3, 3 },
|
||||
3,
|
||||
3,
|
||||
&.{ 1, 2, 3, 4, 5, 6, 7, 8, 9 },
|
||||
);
|
||||
defer mat.deinit();
|
||||
|
||||
try std.testing.expect(try mat.get(&.{ 0, 0 }) == 1);
|
||||
try std.testing.expect(try mat.get(&.{ 1, 0 }) == 2);
|
||||
try std.testing.expect(try mat.get(&.{ 2, 0 }) == 3);
|
||||
try std.testing.expect(try mat.get(&.{ 0, 1 }) == 4);
|
||||
try std.testing.expect(try mat.get(&.{ 1, 1 }) == 5);
|
||||
try std.testing.expect(try mat.get(&.{ 2, 1 }) == 6);
|
||||
try std.testing.expect(try mat.get(&.{ 0, 2 }) == 7);
|
||||
try std.testing.expect(try mat.get(&.{ 1, 2 }) == 8);
|
||||
try std.testing.expect(try mat.get(&.{ 2, 2 }) == 9);
|
||||
}
|
||||
|
||||
test "matrix get 3 dim" {
|
||||
const mat = try Matrix.init(
|
||||
std.testing.allocator,
|
||||
&.{ 2, 2, 2 },
|
||||
&.{ 1, 2, 3, 4, 5, 6, 7, 8 },
|
||||
);
|
||||
defer mat.deinit();
|
||||
|
||||
try std.testing.expect(try mat.get(&.{ 0, 0, 0 }) == 1);
|
||||
try std.testing.expect(try mat.get(&.{ 1, 0, 0 }) == 2);
|
||||
try std.testing.expect(try mat.get(&.{ 0, 1, 0 }) == 3);
|
||||
try std.testing.expect(try mat.get(&.{ 1, 1, 0 }) == 4);
|
||||
try std.testing.expect(try mat.get(&.{ 0, 0, 1 }) == 5);
|
||||
try std.testing.expect(try mat.get(&.{ 1, 0, 1 }) == 6);
|
||||
try std.testing.expect(try mat.get(&.{ 0, 1, 1 }) == 7);
|
||||
try std.testing.expect(try mat.get(&.{ 1, 1, 1 }) == 8);
|
||||
try std.testing.expect(try mat.get(.{ 0, 0 }) == 1);
|
||||
try std.testing.expect(try mat.get(.{ 0, 1 }) == 2);
|
||||
try std.testing.expect(try mat.get(.{ 0, 2 }) == 3);
|
||||
try std.testing.expect(try mat.get(.{ 1, 0 }) == 4);
|
||||
try std.testing.expect(try mat.get(.{ 1, 1 }) == 5);
|
||||
try std.testing.expect(try mat.get(.{ 1, 2 }) == 6);
|
||||
try std.testing.expect(try mat.get(.{ 2, 0 }) == 7);
|
||||
try std.testing.expect(try mat.get(.{ 2, 1 }) == 8);
|
||||
try std.testing.expect(try mat.get(.{ 2, 2 }) == 9);
|
||||
}
|
||||
|
||||
test "matrix fill" {
|
||||
const mat = try Matrix.init(std.testing.allocator, &.{ 5, 5 }, &.{});
|
||||
const mat = try Matrix.init(std.testing.allocator, 5, 5, &.{});
|
||||
defer mat.deinit();
|
||||
mat.fill(123);
|
||||
|
||||
@ -190,9 +230,9 @@ test "matrix fill" {
|
||||
}
|
||||
|
||||
test "matrix add" {
|
||||
const mat1 = try Matrix.init(std.testing.allocator, &.{ 2, 2 }, &.{});
|
||||
const mat1 = try Matrix.init(std.testing.allocator, 2, 2, &.{});
|
||||
defer mat1.deinit();
|
||||
const mat2 = try Matrix.init(std.testing.allocator, &.{ 2, 2 }, &.{});
|
||||
const mat2 = try Matrix.init(std.testing.allocator, 2, 2, &.{});
|
||||
defer mat2.deinit();
|
||||
|
||||
mat1.fill(1);
|
||||
@ -208,9 +248,9 @@ test "matrix add" {
|
||||
}
|
||||
|
||||
test "matrix sub" {
|
||||
const mat1 = try Matrix.init(std.testing.allocator, &.{ 2, 2 }, &.{});
|
||||
const mat1 = try Matrix.init(std.testing.allocator, 2, 2, &.{});
|
||||
defer mat1.deinit();
|
||||
const mat2 = try Matrix.init(std.testing.allocator, &.{ 2, 2 }, &.{});
|
||||
const mat2 = try Matrix.init(std.testing.allocator, 2, 2, &.{});
|
||||
defer mat2.deinit();
|
||||
|
||||
mat1.fill(1);
|
||||
@ -228,7 +268,8 @@ test "matrix sub" {
|
||||
test "matrix neg" {
|
||||
const mat = try Matrix.init(
|
||||
std.testing.allocator,
|
||||
&.{ 3, 3 },
|
||||
3,
|
||||
3,
|
||||
&.{ 1, -2, 3, -4, 5, -6, 7, -8, 9 },
|
||||
);
|
||||
defer mat.deinit();
|
||||
@ -240,3 +281,65 @@ test "matrix neg" {
|
||||
|
||||
try std.testing.expect(std.mem.eql(i64, mat_neg.numbers, expected_numbers));
|
||||
}
|
||||
|
||||
test "matrix row iterator" {
|
||||
const mat = try Matrix.init(
|
||||
std.testing.allocator,
|
||||
3,
|
||||
3,
|
||||
&.{ 1, 2, 3, 4, 5, 6, 7, 8, 9 },
|
||||
);
|
||||
defer mat.deinit();
|
||||
|
||||
var row_iter = mat.row(0);
|
||||
|
||||
try std.testing.expect(row_iter.next() == 1);
|
||||
try std.testing.expect(row_iter.next() == 2);
|
||||
try std.testing.expect(row_iter.next() == 3);
|
||||
try std.testing.expect(row_iter.next() == null);
|
||||
|
||||
row_iter = mat.row(1);
|
||||
|
||||
try std.testing.expect(row_iter.next() == 4);
|
||||
try std.testing.expect(row_iter.next() == 5);
|
||||
try std.testing.expect(row_iter.next() == 6);
|
||||
try std.testing.expect(row_iter.next() == null);
|
||||
|
||||
row_iter = mat.row(2);
|
||||
|
||||
try std.testing.expect(row_iter.next() == 7);
|
||||
try std.testing.expect(row_iter.next() == 8);
|
||||
try std.testing.expect(row_iter.next() == 9);
|
||||
try std.testing.expect(row_iter.next() == null);
|
||||
}
|
||||
|
||||
test "matrix col iterator" {
|
||||
const mat = try Matrix.init(
|
||||
std.testing.allocator,
|
||||
3,
|
||||
3,
|
||||
&.{ 1, 2, 3, 4, 5, 6, 7, 8, 9 },
|
||||
);
|
||||
defer mat.deinit();
|
||||
|
||||
var col_iter = mat.col(0);
|
||||
|
||||
try std.testing.expect(col_iter.next() == 1);
|
||||
try std.testing.expect(col_iter.next() == 4);
|
||||
try std.testing.expect(col_iter.next() == 7);
|
||||
try std.testing.expect(col_iter.next() == null);
|
||||
|
||||
col_iter = mat.col(1);
|
||||
|
||||
try std.testing.expect(col_iter.next() == 2);
|
||||
try std.testing.expect(col_iter.next() == 5);
|
||||
try std.testing.expect(col_iter.next() == 8);
|
||||
try std.testing.expect(col_iter.next() == null);
|
||||
|
||||
col_iter = mat.col(2);
|
||||
|
||||
try std.testing.expect(col_iter.next() == 3);
|
||||
try std.testing.expect(col_iter.next() == 6);
|
||||
try std.testing.expect(col_iter.next() == 9);
|
||||
try std.testing.expect(col_iter.next() == null);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user