Performance of structures as function arguments

1 次查看（过去 30 天）
Dan
Dan 2014-10-2
评论： Dan 2014-10-2
Hi, I sometimes see code where structures are passed into a function and the fields are then stored in local variables, e.g.
function(data)
alpha = data.alpha [...]
Is there a good reason to do this, are the local variables accessed quicker than the structure elements or something?

请先登录，再回答此问题。

采纳的回答

Iain
Iain 2014-10-2
Yes.
The "Good reason", is that an equation, say,
L = 1/2 * rho * Vel.^2 * area * (alpha*P1 + P0);
Is far quicker to read and write than:
Output.Lift = 1/2 * Environment.Density * Aircraft.Velocity.X.^2 * Aircraft.WingSurfaceArea * (Aircraft.Alpha * Aircraft.LiftCoefficientP(1) + Aircraft.LiftCoefficientP0)
Structures (particularly large ones, and arrays of structures) can be much slower than basic variables.
  1 个评论
Dan
Dan 2014-10-2
Ok thanks, i can see that this can be a reason. To clarify though, my interest was not in speed of writing or reading of code, but in Matlab reading structures (not arrays of structures) rather than basic variables.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Get Started with MATLAB 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by