Programmer Guide/Command Reference/EVAL/qinterp - Revision history

193.171.195.48 at 10:34, 21 April 2011

2011-04-21T10:34:16Z

← Older revision		Revision as of 12:34, 21 April 2011
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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>
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	:;<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]]

	~~;See also:~~ [[~~Programmer_Guide~~/~~Command_Reference/EVAL/ipeak\|ipeak]], [[Programmer_Guide/Command_Reference/EVAL/formants\|formants]]~~		[[../#Functions\|<function list>]]

	~~[[Programmer_Guide/Command_Reference/EVAL~~#Functions\|<function list>]]

Toni at 09:32, 11 April 2011

2011-04-11T09:32:45Z

← Older revision		Revision as of 11:32, 11 April 2011
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	[[Programmer_Guide/Command_Reference/EVAL#Functions\|<function list>]]		[[Programmer_Guide/Command_Reference/EVAL#Functions\|<function list>]]


	~~{{DISPLAYTITLE:{{SUBPAGENAME}}}}~~
	~~=====qinterp=====~~

	~~Lays a parabola through three points around each peak value and calculates the interpolated peak. The result is a one or two row vector or matrix.~~

	~~=====Usage:=====~~

	~~<code>qinterp(<var>x</var>, <var>y</var>, <var>ipeak</var>, <var>nwidth</var>)</code>~~

	~~=====Parameters:=====~~

	~~;<var>x</var>~~

	~~:The number for <var>x</var>[i] = i*number or the x-scale vector.~~

	~~;<var>y</var>~~

	~~:The data vector (function).~~

	~~;<var>ipeak</var>~~

	~~:The indices of the peak values or the center of the interpolation.~~

	~~;<var>nwidth</var>~~

	~~:The width of the interpolation. The default is <code>1</code>.~~

	~~=====Return Type:=====~~

	~~vector or matrix~~

	~~=====Result:=====~~

	~~row 1 = xpeak[]~~

	~~row 2 = ypeak[]~~

Toni at 09:27, 11 April 2011

2011-04-11T09:27:03Z

← Older revision		Revision as of 11:27, 11 April 2011
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	;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>
	:<code>qinterp(<var>dx</var><sub>~~scalar~~</sub>, <var>y</var>, <var>ip</var> {, <var>nwidth</var>})</code>		:<code>qinterp(<var>x</var><sub>vector</sub>, <var>y</var>, <var>ip</var> {, <var>nwidth</var>})</code>
	:;<var>dx<var>:distance bewteen x values, <code>x[i] = ''dx'' * i</code>		:;<var>dx</var>:distance bewteen x values; <code>x[i] = ''dx'' * i</code>
	:;<var>x<var>:x data vector		:;<var>x</var>:x data vector
	:;<var>y</var>:y data vector: <code>y[i] = f(x[i])</code>.		:;<var>y</var>:y data vector; <code>y[i] = f(x[i])</code>.
	:;<var>ip</var>: a scalar or vector containing the indices of local maxima		:;<var>ip</var>: a scalar or vector containing the indices of local maxima
	:;<var>nwidth</var>: the width to be used for interpolation		:;<var>nwidth</var>: the width to be used for interpolation

Toni at 09:25, 11 April 2011

2011-04-11T09:25:43Z

← Older revision		Revision as of 11:25, 11 April 2011
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			{{DISPLAYTITLE:{{SUBPAGENAME}}}}
			Compute interploated coordinates of local peaks of a function using 2nd order interpolation.

			;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>
			:;<var>dx<var>:distance bewteen x values, <code>x[i] = ''dx'' * i</code>
			:;<var>x<var>:x data vector
			:;<var>y</var>:y data vector: <code>y[i] = f(x[i])</code>.
			:;<var>ip</var>: a scalar or vector containing the indices of local maxima
			:;<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.

			;See also: [[Programmer_Guide/Command_Reference/EVAL/ipeak\|ipeak]], [[Programmer_Guide/Command_Reference/EVAL/formants\|formants]]

			[[Programmer_Guide/Command_Reference/EVAL#Functions\|<function list>]]


	{{DISPLAYTITLE:{{SUBPAGENAME}}}}		{{DISPLAYTITLE:{{SUBPAGENAME}}}}
	=====qinterp=====		=====qinterp=====

Admin: 1 revision: Initial import

2010-11-18T16:31:40Z

1 revision: Initial import

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193.171.195.8: initial import

2010-05-17T13:05:27Z

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{{DISPLAYTITLE:{{SUBPAGENAME}}}}
=====qinterp=====

Lays a parabola through three points around each peak value and calculates the interpolated peak. The result is a one or two row vector or matrix.

=====Usage:=====

<code>qinterp(<var>x</var>, <var>y</var>, <var>ipeak</var>, <var>nwidth</var>)</code>

=====Parameters:=====

;<var>x</var>

:The number for <var>x</var>[i] = i*number or the x-scale vector.

;<var>y</var>

:The data vector (function).

;<var>ipeak</var>

:The indices of the peak values or the center of the interpolation.

;<var>nwidth</var>

:The width of the interpolation. The default is <code>1</code>.

=====Return Type:=====

vector or matrix

=====Result:=====

row 1 = xpeak[]

row 2 = ypeak[]