Double derivative of a vector of variables in Simscape components.
1 次查看(过去 30 天)
显示 更早的评论
I'm constructing a Simscape component (.ssc file) and I'm confused by the mechanics of declaring the double derivative of a variable, specifically the double derivative of a vector of variables.
Say I declare a variable as follows:
variables
eta = {zeros(4,1),'m'};
end
Now I wish to use the double derivative in my equations can I use a variation of:
equations
eta.der.der == %...
%or
der(eta.der) == %...
end
Or must I also declare a 'derivative variable' say d_eta and use that as a intermediate value?
variables
eta = {zeros(4,1),'m'};
d_eta = {zeros(4,1),'m/s'};
end
equations
eta.der == d_eta;
d_eta.der == %...
end
Thanks in advanced!
PS.
Is there documentation on the working of der([...]) or [...].der?
0 个评论
回答(1 个)
J Chen
2019-4-23
I would say you must use the second approach:
variables
eta = {zeros(4,1),'m'};
d_eta = {zeros(4,1),'m/s'};
end
equations
eta.der == d_eta;
d_eta.der == %...
end
0 个评论
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Equations 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!