Matlab / octave中的映射功能，如LISP中的mapcar

Question

I am looking to find mapping functions in matlab. So here is the example I'm thinking of:

kvec = 0:1:16
kvec =

 0     1     2     3     4     5     6     7     8     9    10    11    12    13    14    15    16

Now I wish to produce a second vector called hvec which essentially computes 10 ^ -k for each value in the kvec.

Is there an elegant way to do that?

Thanks in advance.

Answer 1

I guess what you need is

kvec = 0:1:16;
hvec = 10 .^ -kvec

Answer 2

arrayfun , cellfun , spfun , structfun and bsxfun are some useful mapping functions in MATLAB.

For example using arrayfun hvec would be computed this way:

hvec = arrayfun(@(x) 10^-x, kvec)

This syntax is obviously longer than using array power .^ , but as arrayfun is a mapping function it works for any given function, whereas there are only a few array functions available (whose operators' first character is . such as .^ , .* etc.).