function handle with input parameters
显示 更早的评论
I need to invoke the 'eigs' function to calculate the lowest eigenvalue of a hermitian matrix, which I do not construct explicitly. I thus use a function handle to realize the action of the matrix on a vector. My code is like this
[evector, evalue]=eigs(@fun_Htimesx, dim, 1,'smallestreal');
In the function 'fun_Htimesx', I have
function y = fun_Htimesx(x)
global H transx_many transy_many qx qy Lx Ly
That is, the hermitian matirx 'H' and many other parameters are set as global variables so that I do not need to pass them to the function handle.
Now, my question is, how can avoid global variables? How to pass parameters to a function handle?
采纳的回答
Star Strider
2024-5-1
1 个投票
I am not certain that I understand what you want to do.
One approach:
function y = fun_Htimesx(x, H , transx_many, transy_many, qx, qy, Lx, Ly)
If you only want to pass ‘x’ to it (for example in an optimisation function call), the function handle becomes:
@(x)fun_Htimesx(x, H , transx_many, transy_many, qx, qy, Lx, Ly)
providing that all the other argumnents are already present in the calling script (or function script) workspace. Otherwise, just pass ‘x’ to it if that is the only argument that changes. The others will be passed automatically, providing they are preseent in the calling script (or function script) workspace.
.
2 个评论
Star Strider
2024-5-1
If you want to use all of them to calculate ‘y’ use this approach:
y = fun_Htimesx(x, H , transx_many, transy_many, qx, qy, Lx, Ly);
.
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Linear Algebra 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
