清空筛选条件
清空筛选条件

max_product that t takes v as vector and n as positive integer

2 次查看（过去 30 天）
Wasi von Deutschland
评论： Andrei Bobrov 2017-5-24
My code that's not working. Please help
function [prodout,ind] = max_product(A,n)
A=0;
prodout = exp( conv(log(A),ones(1,n),'valid') );
if isreal(A), prodout=real(prodout);
end

请先登录，再回答此问题。

采纳的回答

Stephen23
Stephen23 2017-5-22
编辑：Stephen23 2017-5-24
Method one: slidefun: Download Jos' excellent FEX submission slidefun, then you just need:
>> max_product = @(v,n)max(slidefun(@prod,n,v,'forward'))
>> [p,x] = max_product([1,2,2,1,3,1],3)
p = 6
x = 3
>> [p,x] = max_product([1,2,3,4,5,6,7,8,9,10], 2)
p = 90
x = 9
Method two: toeplitz:
>> max_product = @(v,n)max(prod(toeplitz(v(n:-1:1),v(n:end)),1));
>> [p,x] = max_product([1,2,2,1,3,1],3)
p = 6
x = 3
>> [p,x] = max_product([1,2,3,4,5,6,7,8,9,10],2)
p = 90
x = 9
  8 个评论
显示 6更早的评论

请先登录，再进行评论。

更多回答（2 个）

Guillaume
Guillaume 2017-5-24
编辑：Guillaume 2017-5-24
Another possible way:
slide = toeplitz(v(1:n), v);
[product, ind] = max(prod(slide(:, n:end)));
  3 个评论
显示 1更早的评论
Guillaume
Guillaume 2017-5-24
For some reason, I'd inverted the order of the arguments to toeplitz.
Now fixed.

请先登录，再进行评论。

Andrei Bobrov
Andrei Bobrov 2017-5-24
编辑：Andrei Bobrov 2017-5-24
max_product = @(A,n)max(exp(conv2(log(A(:)),ones(n,1),'valid')));
use:
>> [value,ii] = max_product([1 2 3 4 5 6 7 8 9 10], 2)
value =
90
ii =
9
>>
or with function hankel:
max_prod_hankel = @(A,n)max(prod(hankel(A(1:n),A(n:end))));
use:
>> [v,ii] = max_prod_hankel([1 2 3 4 5 6 7 8 9 10], 2)
v =
90
ii =
9
>>

类别

在 Help Center 和 File Exchange 中查找有关 CORDIC Algorithms 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by