# Discretise a domain into a grid of uniform volume size

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daniel adams 2021 年 11 月 9 日

Given a domain say in how do I split/discretise the domain into a grid of uniform volume/ fixed number of grid points?
For example given how can I discretise this domain into a grid points? For some given . The linspace function has not been helpful for me.

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### 回答 (1 件)

Sargondjani 2021 年 11 月 9 日
x1 = linspace(0,1,M);
x2 = linspace(0,1,M);
[X1,X2] = ndgrid(x1,x2);
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daniel adams 2021 年 11 月 10 日
Because the grid points arnt exactly the center of the volume bins ( e.g the end points )
Sargondjani 2021 年 11 月 10 日

Ok, so with linspace and ndgrid you get rectangles with equal area. So you only need to find the middle points of each segment? This would be the mean in each dimension.
dx1 = x1(2) - x1(1);%linspace results in equal distances between gridpoints
x1_mid = x1(1:end-1)+dx1;
And the same for x2. You now have a vector x1_mid and x2_mid which are the midpoints of the rectangular areas.

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