产生一个随机数序列，以获得与平均 [英] Generate a random number sequence to get and average
问题描述
我期待生成一个数字序列，每个数字都是70到100之间会有X上的序列中的数字，它会给平均Y的。什么这个算法是什么样子？
I am looking to generate a number sequence where each number is between 70 and 100 there will be x numbers in the sequence and it will give and average of y. What would this algorithm look like?
推荐答案
我觉得这是不可能的，他们70和100，有一个给定的平均同时之间均匀分布的。
I think it is impossible for them to be uniformly distributed between 70 and 100 and have a given average at the same time.
你可以做的就是生成随机数有一个给定的平均值，然后扩展他们融入[70,100]（但他们不会均匀分布有）。
What you can do is generate random numbers that have a given average and then scale them to fit into [70, 100] (but they will not be uniformly distributed there).
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生成随机数[0..1（
generate random numbers [0..1(
计算其平均
乘他们都符合要求的平均
multiply all of them to match the required average
如果其中任何一个不适合到[70,100]，规模个个再次通过相同的因子减少从是的距离（这不改变的平均值）。 X [I] = Y +（X [I] - Y）*比例
if any of them does not fit into [70, 100], scale all of them again by reducing their distance from y by the same factor (this does not change the average). x[i] = y + (x[i] - y)*scale
您将结束与该均在范围[70，100（数字，但它们将跨越该中心位于Y A不同（但重叠）间隔均匀分布。而且，这种方法只适用于真正的/浮点数字。如果你想整数，你在你的手中有一个组合的问题。
You will end up with numbers that are all in the range [70, 100(, but they will be uniformly distributed across a different (but overlapping) interval that is centered on y. Also, this approach only works with real/floating-point numbers. If you want integers, you got a combinational problem on your hands.
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