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# xchange

transform real to pixel coordinates

### Syntax

[x1, y1, rect] = xchange(x, y, dir)

### Arguments

- x, y
two matrices of size

`(n1, n2)`

(coordinates of a set of points).- dir
a string, parameter used to specify the conversion type (See "Description" for details).

- x1, y1
two matrices of size

`(n1, n2)`

(coordinates of the set of points).- rect
a vector of size 4.

### Description

After having used a graphics function, `xchange`

computes pixel coordinates from real coordinates and conversely,
according to the value of the parameter `dir`

:
`"f2i"`

(float to int) means real to pixel and
`"i2f"`

(int to float) means pixel to real.

`x1`

and `y1`

are the new
coordinates of the set of points defined by the old coordinates
`x`

and `y`

.

`rect`

is the coordinates in pixel of the rectangle
in which the plot was done: `[upper-left point, width, height]`

.

## Comments

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