interp1

Linear 1-D data interpolation

📝Syntax

vq = interp1(x, v, xq)
vq = interp1(x, v, xq, 'linear')
vq = interp1(v, xq)
vq = interp1(v, xq, 'linear')

📥Input Arguments

Parameter	Description
x	Sample points: vector.
v	Sample values: vector, matrix.
xq	Query points: scalar, vector, matrix.

📤Output Arguments

Parameter	Description
vq	Interpolated values: scalar, vector, matrix.

📄Description

vq = interp1(x, v, xq) returns interpolated values of a 1-D function at specific query points using linear interpolation.

💡Examples

f = figure();
v = [0  1.41  2  1.41  0  -1.41  -2  -1.41 0];
xq = 1.5:8.5;
vq = interp1(v,xq);
plot(1:9, v, 'o', xq, vq, '*');
legend('v','vq');

📚Bibliography

de Boor, C., A Practical Guide to Splines, Springer-Verlag, 1978.

🕔Version History

Version	Description
1.0.0	initial version