calculating x when y is > 0
2 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Gavin Seddon
le 13 Fév 2019
Commenté : Gavin Seddon
le 14 Mar 2019
Hello
I have plotted a changing distance (d(x)) with time using cftool and calculated the function. Its derivative was calculated and this is v(x). when plotted with fplot the initial Y values are 0. I am calculating the x position at which this rises above the x axes (y>0). To do this i made v(x) equivalent to 1 (==1) and evluated x yet:
>>v(x)==1
ans =
(4119*x^2)/10000 - (1787*x)/5000 + 891/2500 ==1
>> eval x
x =
x
Will someone please help to calculate this? i can measure the x value directly. It is preferable to standardise this procedure.
GS.
2 commentaires
Réponse acceptée
Walter Roberson
le 14 Fév 2019
solve(v(x)==1,x)
16 commentaires
Walter Roberson
le 13 Mar 2019
Do you mean that the second column of your table contains x values ? If so then
YourTable.NewThirdColumn = double( subs( v, x, YourTable.{:,2}));
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Polynomials dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!