Write a vectorial function from a scalar function

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Giuseppe Milazzo
Giuseppe Milazzo 2022-7-23
评论： Walter Roberson 2022-7-23
I have a scalar function of multiple variables, let's say f = @(x,y) x^2 + y^2 (for example).
Now i have another vectorial variable z = [z1,z2,....,zn].' and i would like to build a vectorial function F such that F(i) = f(z(i),y).
Note that F needs to be a fun element and not sym, since i need to perform optimization using fminsearch.
Thank you in advance.

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回答（1 个）

David Goodmanson
David Goodmanson 2022-7-23
编辑：David Goodmanson 2022-7-23
Hi Giuseppi,
it looks like you intend, in this case,
f = @(z,y) z.^2 + y^2
Here .^ gives the element-by-element square of z, and in general you would use commands that preserve the vector nature of the input variable to give an output with the same dimension (row or column) as the input vector. In this case y^2 is a scalar so it is automatically added to each component of z.^2 .
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David Goodmanson
David Goodmanson 2022-7-23
most Matlab functions including trig functions are vector-in vector-out functions so it is almost always possible to create a vector-in vector-out function using .* .^ ./ sin cos exp and so forth

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