Julia <matrix>

matrix.jl

m1 = [1 2 3] # 横行列
m2 = [1; 2; 3] # 縦行列 [1, 2, 3]と同等 
println("m1 = ", m1)
println("m2 = ", m2)

# 2×2の行列
m3 = [
2 3;
4 5;
]

m4 = [
1 2;
2 2;
]
println("m3 = ", m3)
println("m4 = ", m4)
println("2*m3 = ", 2m3)

# 転置
println("m3の転置 : ",m3')

# 逆行列
m5 = inv(m3)
println("m3の逆行列 : ", m5)

# 行列の演算
println("m3-m4 = ", m3-m4)
println("行列の積 m3*m4 = ", m3*m4)
println("行列の各要素同士の積 : ", m3.*m4)

# 連立一次方程式

# x - 2y + 3z = 1
# 3x + y - 5z = -4
# -2x + 6y - 9z = -2

A = [1 -2 3; 3 1 -5; -2 6 -9]
b = [1; -4; -2]
x, y, z = A\b # 実行結果は[1.0, 3.0, 2.0]となるが行列の各要素を変数xyzに代入する
println("x = $x, y = $y, z = $z")