Programmer Guide/Command Reference/EVAL/wsum: Difference between revisions

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{{DISPLAYTITLE:{{SUBPAGENAME}}}}
{{DISPLAYTITLE:{{SUBPAGENAME}}}}
Calculate the weighted sum over one or more user-defined extents of a function <var>y = f(x)</var>. Depending on the number of extents, the result of the function is a vector or a scalar.
Calculate the weighted sum over one or more user-defined extents of a function <var>y = f(x)</var>. Depending on the number of extents, the result of the function is a vector or a scalar.
;Usage:  
;Usage:  
:'''<code>wsum(<var>x</var>, <var>y</var>, <var>w</var>, <var>s</var>, <var>us</var>, <var>os</var>, <var>n</var>)</code>'''
:<code>wsum(<var>x</var>, <var>y</var>, <var>w</var>, <var>s</var>, <var>us</var>, <var>os</var>, <var>n</var>)</code>
:'''<code>sum(<var>x</var>, <var>y</var>, <var>w</var>, <var>s</var>, <var>uv</var>, <var>ov</var>)</code>'''
:<code>wsum(<var>x</var>, <var>y</var>, <var>w</var>, <var>s</var>, <var>uv</var>, <var>ov</var>)</code>
:'''<code>sum(<var>x</var>, <var>y</var>, <var>w</var>, <var>s</var>, <var>rv</var>)</code>'''
:<code>wsum(<var>x</var>, <var>y</var>, <var>w</var>, <var>s</var>, <var>rv</var>)</code>
:'''<code>sum(<var>x</var>, <var>y</var>, <var>w</var>, <var>s</var>, <var>rm</var>)</code>'''
:<code>wsum(<var>x</var>, <var>y</var>, <var>w</var>, <var>s</var>, <var>rm</var>)</code>
:;<var>x, y</var>: the x- and y-data vector; y[i] = f(x[i])
:;<var>x, y</var>: the x- and y-data vector: <code>''y''[i] = f(''x''[i])</code>
:;<var>w</var>defines the type of the weighting function  
:;<var>w</var>: defines the type of the weighting function  
::{class="keinrahmen"
::{|class="keinrahmen"
|''w''=0 ||no weight (rectangle)
|''w''=0 ||no weight (rectangle)
|-
|-
Line 18: Line 17:
|''w''=2 ||hamming window
|''w''=2 ||hamming window
|}
|}
:;<var>s</var>if this argument is set to '''1''' the sum of each extent is normalized (scaled by <code>1/sum(weights)</code>), otherwise not
:;<var>s</var>: if this argument is set to '''1''' the sum of each extent is normalized (scaled by <code>1/sum(weights)</code>), otherwise not
:;<var>us, os, n</var>: Every pair <code>{''us''+d*i, ''us''+d*(i+1)} (with: d=(''os''-''us'')/n, i=0..n-1)</code> defines an extent to sum. All three arguments are scalars.
:;<var>uv, ov</var>: Every pair <code>{''uv''[i], ''ov''[i]} (with: i=0..nrow(''uv'')-1)</code> defines an extent to sum. Both arguments must be vectors with same length.
:;<var>rv</var>: Every pair <code>{''rv''[i], ''rv''[i+1]} (with: i=0..nrow(''rv'')-2)</code> defines an extent to sum. The argument must be vector.
:;<var>rm</var>: Every pair <code>{''rm''[i,0], ''rm''[i,1]} (with: i=0..nrow(''rm'')-1)</code> defines an extent to sum. The argument must be matrix with 2 columns.
;Result: The result ''r'' is a scalar or a vector. Each element ''r''<sub>i</sub> is the sum of weighted the ''y '' values over the i-th extent {xmin<sub>i</sub>, xmax<sub>i</sub>}.
:Note: an extent is defined by the x-range {xmin, xmax} and not by the indices!
:Note: an extent is defined by the x-range {xmin, xmax} and not by the indices!
:;<var>us, os, n</var>: ''us'' is the lowest x-value, ''os'' the highest and ''n'' the number of extents. All three arguments are scalars. Every pair <code>{'us'+d*k, ''us''+d*(k+1)} (with: d=(''os''-''us'')/n, k=0..n-1)</code> defines an extent to sum.
;See also: [[../sum|sum]], [[../hist|hist]]
:;<var>uv, ov</var>: Every pair <code>{''uv''[k], ''ov''[k]} (with k=0..nrow(''uv'')-1)</code> defines an extent to sum. Both arguments must be vectors with same length.
:;<var>rv</var>: Every pair <code>{''rv''[k], ''rv''[k+1]} (with k=0..nrow(''rv'')-2)</code> defines an extent to sum. The argument must be vector.
:;<var>rm</var>: Every pair <code>{''rm''[k,0], ''rm''[k,1]} (with k=0..nrow(''rm'')-1)</code> defines an extent to sum. The argument must be matrix with 2 columns.
;Result: The result ''r'' is a scalar or a vector. Each element ''r''<sub>i</sub> is the sum of weighted the ''y '' values over the i-th extent {xmin<sub>i</sub>, xmax<sub<i></sub>}.
 
;See also: [[Programmer_Guide/Command_Reference/EVAL/sum|sum]], [[Programmer_Guide/Command_Reference/EVAL/hist|hist]]


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

Latest revision as of 13:22, 21 April 2011

Calculate the weighted sum over one or more user-defined extents of a function y = f(x). Depending on the number of extents, the result of the function is a vector or a scalar.

Usage
wsum(x, y, w, s, us, os, n)
wsum(x, y, w, s, uv, ov)
wsum(x, y, w, s, rv)
wsum(x, y, w, s, rm)
x, y
the x- and y-data vector: y[i] = f(x[i])
w
defines the type of the weighting function
w=0 no weight (rectangle)
w=1 triangle
w=2 hanning window
w=2 hamming window
s
if this argument is set to 1 the sum of each extent is normalized (scaled by 1/sum(weights)), otherwise not
us, os, n
Every pair {us+d*i, us+d*(i+1)} (with: d=(os-us)/n, i=0..n-1) defines an extent to sum. All three arguments are scalars.
uv, ov
Every pair {uv[i], ov[i]} (with: i=0..nrow(uv)-1) defines an extent to sum. Both arguments must be vectors with same length.
rv
Every pair {rv[i], rv[i+1]} (with: i=0..nrow(rv)-2) defines an extent to sum. The argument must be vector.
rm
Every pair {rm[i,0], rm[i,1]} (with: i=0..nrow(rm)-1) defines an extent to sum. The argument must be matrix with 2 columns.
Result
The result r is a scalar or a vector. Each element ri is the sum of weighted the y values over the i-th extent {xmini, xmaxi}.
Note: an extent is defined by the x-range {xmin, xmax} and not by the indices!
See also
sum, hist

<function list>

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