# Extract.msr

From spatstat v1.57-1
by Adrian Baddeley

##### Extract Subset of Signed or Vector Measure

Extract a subset of a signed measure or vector-valued measure.

##### Usage

```
# S3 method for msr
[(x, i, j, …)
```

##### Arguments

- x
A signed or vector measure. An object of class

`"msr"`

(see`msr`

).- i
Object defining the subregion or subset to be extracted. Either a spatial window (an object of class

`"owin"`

), or a pixel image with logical values, or any type of index that applies to a matrix.- j
Subset index selecting the vector coordinates to be extracted, if

`x`

is a vector-valued measure.- …
Ignored.

##### Details

This operator extracts a subset of
the data which determines the signed measure
or vector-valued measure `x`

. The result is another measure.

##### Value

An object of class `"msr"`

.

##### See Also

##### Examples

```
# NOT RUN {
X <- rpoispp(function(x,y) { exp(3+3*x) })
fit <- ppm(X ~x+y)
rp <- residuals(fit, type="pearson")
rs <- residuals(fit, type="score")
rp[square(0.5)]
rs[ , 2:3]
# }
```

*Documentation reproduced from package spatstat, version 1.57-1, License: GPL (>= 2)*

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