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simple coding, how to write (x-1)...(x-n)

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ahmed lamak
ahmed lamak 2016-9-5
评论： Stephen23 2016-9-5
How would i write (x-1)(x-2)....(x-n)
for a given n in matlab

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回答（2 个）

Image Analyst
Image Analyst 2016-9-5
Try this:
result = 1
for k = 1 : n
result = result * (x - k);
end
  2 个评论
ahmed lamak
ahmed lamak 2016-9-5
i gave a simple example as the zeros being 1 : n, if they were rather complicated values and denoted as say z(1),z(2),...,z(n) this method wont work?
Image Analyst
Image Analyst 2016-9-5
You can do this:
result = 1
for k = 1 : length(z)
result = result * (x - z(k));
end

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Stephen23
Stephen23 2016-9-5
编辑：Stephen23 2016-9-5
The simplest solution, without any loops:
prod(x-z)
  2 个评论
Walter Roberson
Walter Roberson 2016-9-5
I do not understand why you are raising to the z'th power ??
Stephen23
Stephen23 2016-9-5
@Walter Roberson: experimenting around, and not paying enough attention to the copy-and-paste :(

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