Invalid syntax error when inputting input arguments
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I am attempting to get a redboard Arduino Uno to communicate with MATLAB. I have run into the following error when entering input arguments as shown:
function [time, data] = ReadRedBoardData_v2('/dev/cu.wchusbserialfa130', 10, 3000, 'EKG')
Error:Error: File:
ReadRedBoardData_v2.m Line:
1 Column: 45
Invalid expression. Check
for missing multiplication
operator, missing or
unbalanced delimiters, or
other syntax error. To
construct matrices, use
brackets instead of
parentheses.
采纳的回答
Steven Lord
2020-6-21
When defining a function you need to give the names of the variables that will contain the data with which the user will call your function.
function [time, data] = ReadRedBoardData_v2(location, x, y, z)
When calling a function you don't include the function keyword.
[time, data] = ReadRedBoardData_v2('/dev/cu.wchusbserialfa130', 10, 3000, 'EKG')
In this call to ReadRedBoardData_v2 (with the definition I gave above) the variable location will contain '/dev/cu.wchusbserialfa130', the variable x will contain 10, the variable y will contain 3000, and the variable z will contain 'EKG'.
3 个评论
Scott hUDSON
2020-6-21
Scott hUDSON
2020-6-21
Steven Lord
2020-6-22
If you have a function:
function y = timestwo(x)
q = 2*x;
end
and you call this:
z = timestwo(21)
the value of y inside timestwo will be returned and stored in the variable z. What value is that? Since timestwo never assigned a value to the variable y, MATLAB doesn't know what to return and so you'll receive an error. To fix the problem assign something to the output variable.
function y = timestwo(x)
y = 2*x;
end
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