Programmer Guide/Command Reference/EVAL/qinterp: Difference between revisions
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{{DISPLAYTITLE:{{SUBPAGENAME}}}} | {{DISPLAYTITLE:{{SUBPAGENAME}}}} | ||
Compute interploated coordinates of local peaks of a function using 2nd order interpolation. | Compute interploated coordinates of local peaks of a function using 2nd order interpolation. | ||
;Usage: | ;Usage: | ||
:<code>qinterp(<var>dx</var><sub>scalar</sub>, <var>y</var>, <var>ip</var> {, <var>nwidth</var>})</code> | :<code>qinterp(<var>dx</var><sub>scalar</sub>, <var>y</var>, <var>ip</var> {, <var>nwidth</var>})</code> | ||
| Line 11: | Line 10: | ||
:;<var>nwidth</var>: the width to be used for interpolation | :;<var>nwidth</var>: the width to be used for interpolation | ||
;Result: A vector ''r'' with 2 elements (''r''[0] = xpeak, ''r[1]'' = ypeak) or a matrix with two rows (''r''[0,j] = xpeak<sub>j</sub>, ''r[1,j]'' = ypeak<sub>j</sub>) containing the interpolated coordinates of the local maxima (peaks). For the 2nd order (parabolic) interpolation the (x,y) points at ''ip-npeaks'', ''ip'' and ''ip+npeask'' are used. | ;Result: A vector ''r'' with 2 elements (''r''[0] = xpeak, ''r[1]'' = ypeak) or a matrix with two rows (''r''[0,j] = xpeak<sub>j</sub>, ''r[1,j]'' = ypeak<sub>j</sub>) containing the interpolated coordinates of the local maxima (peaks). For the 2nd order (parabolic) interpolation the (x,y) points at ''ip-npeaks'', ''ip'' and ''ip+npeask'' are used. | ||
;See also: [[../ipeak|ipeak]], [[../formants|formants]], [[../interp|interp]] | |||
[[../#Functions|<function list>]] | |||
Latest revision as of 11:34, 21 April 2011
Compute interploated coordinates of local peaks of a function using 2nd order interpolation.
- Usage
qinterp(dxscalar, y, ip {, nwidth})qinterp(xvector, y, ip {, nwidth})- dx
- distance bewteen x values;
x[i] = dx * i - x
- x data vector
- y
- y data vector;
y[i] = f(x[i]). - ip
- a scalar or vector containing the indices of local maxima
- nwidth
- the width to be used for interpolation
- Result
- A vector r with 2 elements (r[0] = xpeak, r[1] = ypeak) or a matrix with two rows (r[0,j] = xpeakj, r[1,j] = ypeakj) containing the interpolated coordinates of the local maxima (peaks). For the 2nd order (parabolic) interpolation the (x,y) points at ip-npeaks, ip and ip+npeask are used.
- See also
- ipeak, formants, interp
