how to define a function
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why do I have error message when I type
function dy = ff(t,y)
2 个评论
Charles Kinoshita
2017-7-21
编辑：Stephen23
2017-7-21
Steven Lord
2017-7-21
No. You cannot define functions by typing the text of their body at the Command Prompt. You need to write them as a function file. [If your function can be written as one statement, you could create an anonymous function handle.]
回答（1 个）
James Tursa
2017-7-20
编辑：James Tursa
2017-7-20
If you are getting this message:
Error: Function definitions are not permitted in this context.
It means that you cannot define a function in that part of the code. E.g., you cannot define functions at the end of script files in older versions of MATLAB. So either turn your script file into a function file itself, or copy your function code to a new file (with the name ff.m).
But this is all just a guess, since you haven't told us what the error message is or shown us any code.
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