![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/178554/image.png)
shift array to flat
1 visualizzazione (ultimi 30 giorni)
Mostra commenti meno recenti
hello,
i have a 142 element array that generates a curve (attached). when a line is drawn from end to end the line is at a certain (unknown) slope. how could i adjust the values in the array so that when plotted and a line drawn from end to end of the curve, the slope is 0?
picture and array is attached.
0 Commenti
Risposta accettata
Cedric
il 7 Ott 2017
Modificato: Cedric
il 7 Ott 2017
plot( unnamed, 'b' ) ;
hold on ; grid on ;
x = (1 : length(unnamed)).' - 1 ;
slope = (unnamed(end) - unnamed(1)) / (length(unnamed) - 1) ;
y = unnamed - (unnamed(1) + x * slope) ;
plot( y, 'g' ) ;
but we often need something else :
plot( detrend( unnamed ), 'r' ) ;
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/178554/image.png)
with
>> mean( detrend( unnamed ))
ans =
-3.9612e-18
>> mean( y )
ans =
-0.0011
2 Commenti
Cedric
il 7 Ott 2017
Modificato: Cedric
il 7 Ott 2017
doc detrend : removes linear trend.
What I understood from your question was that you wanted the green line on my plot, which is the curve shifted up based on the value defined by the black line. If it is correct, this is what I compute/define as y.
Thinking a bit more about it, you may want
y = unnamed - x * slope ;
if you want the first value to match.
Più risposte (0)
Vedere anche
Categorie
Scopri di più su Multirate Signal Processing in Help Center e File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!