How to code a ramp function?
55 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hi,
I tried to code a ramp function as attached herewith.
But getting an error
"Operands to the logical AND (&&) and OR (||) operators must be convertible to logical scalar values. Use the ANY
or ALL functions to reduce operands to logical scalar values."
Hence I need your valuable suggestion so as to run the same.
function r = ramp(t)
tstep = 10;
tmin = 0;
tmax = 10;
t = linspace(tmin,tmax,tstep);
if t<=4
H0=0.2*t;
end
if t>=5 && t<=7
H0=max(0,t);
end
if t>=8
H0=0.2*t;
end
plot(H0,t)
with regards,
rc
0 commentaires
Réponse acceptée
Walter Roberson
le 8 Nov 2023
t = linspace(tmin,tmax,tstep);
t is a vector.
if t<=4
MATLAB treats that as equivalent to
if all(t<=4)
and the body of the if would be executed only if no entries in t are greater than 4. But with the particular values you used for linspace() there are some values greater than 4 in t, so the if would fail.
if t>=5 && t<=7
That would be treated like
if all(t>=5 && t<=7)
which would fail for vector t because && can only be used with scalars. If you had coded
if t>=5 & t<=7
then the & operation could succeed, returning a vector of values, and the statement would be equivalent to
if all(t>=5 & t<=7)
but that would fail beause there are some values outside that range.
H0=0.2*t;
That would take all of the vector t and multiply by 0.2, and asssign the vector result to H0. But that is not going to be assigning those values to H0 selectively according to which elements in t are <= 4.
You need to proceed by using a for loop, or by putting the code into a function and using arrayfun so that you never pass in a non-scalar value. Or you need to learn how to use logical indexing. https://www.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html
0 commentaires
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Matrix Indexing 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!