# matrixSmooth: Smooth a Matrix In oce: Analysis of Oceanographic Data

 matrixSmooth R Documentation

## Smooth a Matrix

### Description

The values on the edge of the matrix are unaltered. For interior points, the result is defined in terms in terms of the original as follows. r_[i,j] = (2 m_[i,j] + m_[i-1,j] + m_[i+1,j] + m_[i,j-1] + m_[i,j+1])/6. Note that missing values propagate to neighbours.

### Usage

```matrixSmooth(m, passes = 1)
```

### Arguments

 `m` a matrix to be smoothed. `passes` an integer specifying the number of times the smoothing is to be applied.

### Value

A smoothed matrix.

Dan Kelley

### Examples

```library(oce)
m <- matrix(rep(seq(0, 1, length.out=5), 5), nrow=5, byrow=TRUE)
m[3, 3] <- 2
m1 <- matrixSmooth(m)
m2 <- matrixSmooth(m1)
m3 <- matrixSmooth(m2)
par(mfrow=c(2, 2))
image(m,  col=rainbow(100), zlim=c(0, 4), main="original image")
image(m1, col=rainbow(100), zlim=c(0, 4), main="smoothed 1 time")
image(m2, col=rainbow(100), zlim=c(0, 4), main="smoothed 2 times")
image(m3, col=rainbow(100), zlim=c(0, 4), main="smoothed 3 times")
par(opar)
```

oce documentation built on June 12, 2022, 1:05 a.m.