interpln linear interpolation

## Syntax

    [y]=interpln(xyd,x)

## Arguments

xyd

  2 row matrix (xy coordinates of points)

x

  vector (abscissae)

y

  vector (y-axis values)

## Description

given `xyd` a set of points in the xy-plane which increasing abscissae and `x` a set of abscissae, this function computes `y` the corresponding y-axis values by linear interpolation.

## Examples

    x=[1 10 20 30 40];
    y=[1 30 -10 20 40];
    plot2d(x',y',[-3],"011"," ",[-10,-40,50,50]);
    yi=interpln([x;y],-4:45);
    plot2d((-4:45)',yi',[3],"000");

x=[1 10 20 30 40]; y=[1 30 -10 20 40]; plot2d(x',y',[-3],"011"," ",[-10,-40,50,50]); yi=interpln([x;y],-4:45); plot2d((-4:45)',yi',[3],"000");

## See also

- splin
- interp
- smooth