Jacobian matrix

Description

example

jacobian(f,v) calculates the Jacobian matrix of f with regard to v. The (i,j) component of the result is ∂ f(i)∂ v(j).

Examples

Jacobian of Vector Function

The Jacobian of a vector function is a matrix of the partial derivatives of that function.

Compute the Jacobian matrix of [x * y * z, y ^ 2, x + z] with respect to [x, y, z]

syms x y z jacobian( [x * y * z, y ^ 2, x + z], [x, y, z] ans = [y * z, x * z, x * y] [0, 2 * y, 0] [1, 0, 1] Now, calculate the Jacobian of [x * y * z, y ^ 2, x + z] with respect to [x; y; z]jacobian( [x * y * z, y ^ 2, x + z], [x; y; z] ans = [y * z, x * z, x * y] [0, 2 * y, 0] [1, 0, 1] The Jacobian matrix is invariant to the orientation of the vector in the second input position.Jacobian of Scalar Function The Jacobian of a scalar function is the

transpose of its gradient. Calculate the Jacobian of 2 * x +3 * y+4 * z with respect to [x, y, z] syms x y z jacobian(2 * x + 3 * y + 4 * z, [x, y, z]

Now, calculate the gradient of the very same expression.gradient (2 * x+3 * y+4 * z, [x, y, z]

Jacobian with Respect to Scalar

The Jacobian of a function with regard to a scalar is the very first derivative of that function. For a vector function, the Jacobian with respect to a scalar is a vector of the first derivatives.

Calculate the Jacobian of [x ^ 2 * y, x * sin(y)] with respect to x.syms x y jacobian( [x ^ 2 * y, x * sin(y)], x)

Now, compute the derivatives.diff ([ x ^ 2 * y, x * sin(y)], x)

Input Arguments

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f– Scalar or vector function
symbolic expression|symbolic function|symbolic vector

Scalar or vector function, defined as a symbolic expression, function, or vector. If f is a scalar, then the Jacobian matrix of f is the shifted gradient of f.

v– Vector of variables with respect to which you calculate Jacobian
symbolic variable|symbolic vector

Vector of variables with respect to which you compute Jacobian, specified as a symbolic variable or vector of symbolic variables. If v is a scalar, then the outcome is equal to the transpose of diff(f, v). If v is an empty symbolic things, such as sym( [], then jacobian returns an empty symbolic item.

More About

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Jacobian Matrix

The Jacobian matrix of the vector function f = (f1(x1, …,xn), …,fn(x1, …,xn)) is the matrix of the derivatives of f:

J(x1, … xn)= [∂ f1 ∂ x1 ⋯ ∂ f1 ∂ xn ⋮ ⋱ ⋮ ∂ fn ∂ x1 ⋯ ∂ fn ∂ xn]

Introduced prior to R2006a

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