matlab accumarray
时间: 2023-10-24 10:19:01 浏览: 38
`accumarray` is a function in MATLAB that is used to group and accumulate data in an array based on the values in another array. It is useful for data analysis, statistical calculations, and many other applications.
The syntax of the `accumarray` function is:
`B = accumarray(subs, val)`
where `subs` is a matrix of subscript values, and `val` is a matrix of corresponding values. The output `B` is a vector or matrix of accumulated values, where each element in `B` corresponds to a unique combination of subscripts in `subs`.
For example, suppose we have the following data:
```
subs = [1; 2; 2; 3; 3; 3];
val = [10; 20; 30; 40; 50; 60];
```
We can use `accumarray` to calculate the sum of the values for each unique subscript:
```
B = accumarray(subs, val, [], @sum)
```
The resulting `B` matrix would be:
```
B =
10
50
150
```
This means that the sum of the values for subscript 1 is 10, the sum for subscript 2 is 50, and the sum for subscript 3 is 150.
The `accumarray` function can also be used for other types of accumulations, such as counting, averaging, and finding the minimum or maximum value.
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