How can I output variables from a handle function passed as param to a set function?

Question

Armando Perez 2014-3-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/121588-how-can-i-output-variables-from-a-handle-function-passed-as-param-to-a-set-function

回答： Armando Perez 2014-3-16

Hello,

I would like to use an output variable generated inside a handle function which is passed as parameter to a set function. I mean, I have a main code (which I haven´t added here so as not to complicate my question). In this main code,I call the function frying_pan_position_keypress(y). Then, when I press the left arrow key, eg, I calculate te variable j, and I would like to pass this variable to the main code.

This is my code:

function j=frying_pan_position_keypress(y)

set(gcf,'KeyPressFcn',{@frying_pan_movement,y});

    function j=frying_pan_movement(scr,event,y)
        switch event.Character
                    case 28
                        j=y-2
                    case 29 
                        j=y+2
                    case 30
                        j=y-10
                    case 31
                        j=y+10
                end
    end
end

Lots of thanks in advance.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Joseph Cheng 2014-3-14

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/121588-how-can-i-output-variables-from-a-handle-function-passed-as-param-to-a-set-function#answer_128421

编辑：Joseph Cheng 2014-3-14

http://stackoverflow.com/questions/16613252/how-to-use-keypressfcn-in-matlab-with-a-function-already-create I think the stackoverflow thread in the link may help.

edit: did a quick mockup and maybe easiest way is to just create a global variable? Probably not the Best solution.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

Armando Perez 2014-3-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/121588-how-can-i-output-variables-from-a-handle-function-passed-as-param-to-a-set-function#answer_128630

First of all, I would like to thank you for being so fast at the time to answer my question.

I have already tried to create ''j'' as global variable but it doesn´t work. The ''j'' outside and the ''j'' inside the handle function is a different variable. What I think I need is to be able to get j as an ouput from function set which is the link between the funcion and the handle function.

I have read that help in stackoverflow before but it is only explained how to use and create keyboard interruptions and its handle functions. And it doesn´t explain how to get a variable outside it to be able to use it in a main program.

I'm going to keep in it but any help will be very useful.