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Aide de Scilab >> Graphiques > Datatips > orthProj

# orthProj

Computes the orthogonal projection of a point to a polyline in the plane.

### Calling Sequence

`[d,ptp,ind,c] = orthProj(data,pt)`

### Arguments

data

a n by 2 array. The first column contains the X coordinates of the poyline, while the second one contains the Y coordinates.

pt

an array with 2 entries: the coordinates of the point

d

The minimum distance between the given point and a polyline data point.

ptp

an array with 2 entries: the coordinates of the point that realizes the minimum distance

ind

The polyline closest point lies on the segment `[ind ind+1]`.

c

The interpolation coefficient of the orthonal projection.

### Description

Computes the orthogonal projection of a point to a polyline in the plane.

### Examples

```x=linspace(0,1,30)';
y=sin(4*x.^3)/2;
clf();a=gca();a.isoview='on';
plot(x,y)
pt=[0.7 0.3];
plot(pt(1),pt(2),'xb')
[d,ptp,ind,c]=orthProj([x y],pt);
plot(x(ind:ind+1),y(ind:ind+1),'+r')
xpoly([pt(1);ptp(1)],[pt(2);ptp(2)])
e=gce();e.polyline_style=4;e.arrow_size_factor = 1.5;

pt=[0.75 -0.3];
plot(pt(1),pt(2),'xb')
[d,ptp,ind,c]=orthProj([x y],pt);
plot(x(ind:ind+1),y(ind:ind+1),'+r')
xpoly([pt(1);ptp(1)],[pt(2);ptp(2)])
e=gce();e.polyline_style=4;e.arrow_size_factor = 1.5;```
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