Undefined function 'writePosition' for input arguments of type 'double'
显示 更早的评论
Hi, I have followed the guide from this page (https://www.mathworks.com/help/supportpkg/arduinoio/ug/control-servo-motors.html) on how to set up the servo motor via Arduino on Matlab.
However, I keep getting the following the error message: Undefined function 'writePosition' for input arguments of type 'double'
This page (https://www.mathworks.com/help//supportpkg/arduinoio/ref/writeposition.html) states that the writePosition function can take in any numeric value from 0 to 1, but yet the error shows up.
Why is this happening?
My code is as shown below:
Thank you.
7 个评论
madhan ravi
2019-1-18
Do you have arduino hardware support package installed?
Kin Sun Wong
2019-1-18
madhan ravi
2019-1-18
编辑：madhan ravi
2019-1-18
which version are you using 2018a?
Kin Sun Wong
2019-1-18
Kin Sun Wong
2019-1-18
madhan ravi
2019-1-18
I mean which release are you using 2018 a ?
Kin Sun Wong
2019-1-18
回答（2 个）
madhan ravi
2019-1-18
change
function interval(x)
to
function interval
14 个评论
Kin Sun Wong
2019-1-18
madhan ravi
2019-1-18
编辑：madhan ravi
2019-1-18
Type the below in command window:
which writePosition -all % what shows up?
Kin Sun Wong
2019-1-18
Kin Sun Wong
2019-1-18
madhan ravi
2019-1-18
编辑：madhan ravi
2019-1-18
what's the value of s?
Kin Sun Wong
2019-1-18
Kin Sun Wong
2019-1-18
However, if I were to run this code directly in the command window, it works. But it does not run properly as a function.
madhan ravi
2019-1-18
uncomment the two lines before global a , see that's why global is not recommended making it harder to debug!!!
Kin Sun Wong
2019-1-18
But doing so will give me the following issues, while the writePosition issue still remains.
madhan ravi
2019-1-18
remove global a and global s
Kin Sun Wong
2019-1-18
madhan ravi
2019-1-18
编辑：madhan ravi
2019-1-18
how are you calling it ? by pressing the green triangle button ?can you upload the code?
Kin Sun Wong
2019-1-18
madhan ravi
2019-1-18
oh good , glad that you found , anytime :)
类别
在 帮助中心 和 File Exchange 中查找有关 Arduino Hardware 的更多信息
2019-1-18
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
