New line in legend does not work anymore in MATLAB 2017b

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Chris
Chris 2018-12-13
编辑： dpb 2018-12-20
Hi,
I want to make a multi line legend with MATLAB 2017b:
plot([1:100;1:5:500]');
legend({['test 1' char(10) 'done'],['test 2' char(10) 'done']});
This results in:
Problem_2017b.png
In previous versions of MATLAB this reulted in:
Problem_2017b_before.png
which is what I want.
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dpb
dpb 2018-12-18
OP could check that hypothesis fairly quickly...doesn't indicate whether has tried from a clean slate minimal test or not...I was presuming that would also fail on his system, but guess it's possible it wouldn't.
Then would be a treat to try to figure out which specific setting may have done the dirty...
Chris
Chris 2018-12-18
I reinstalled matlab which solved the problem....
Thanks everyone for their help!

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回答（1 个）

Yair Altman
Yair Altman 2018-12-18
The reason for the problem is that the default legend Interpreter ('lex') does not know how to interpret the '\n' in the label. \ prefixes are reserved in lex for special commands, but \n is not one of them (reference). Instead, you should use the char(10) or run your string through sprintf():
legend({'test 1\ndone', 'test 2\ndone'}) % not good
legend({sprintf('test 1\ndone'), sprintf('test 2\ndone')}) % good
legend({['test 1' 10 'done'], ['test 2' 10 'done']}) % also good
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Jan
Jan 2018-12-18
It works for me also under all Matlab releases I've tested: R6.5, R2009a, R2015a, R2016b. But for the OP it failed in 2017b and in another thread (link) R2017a was concerned. Re-installing 2017b solved (link) the problem for the OP. So I'm afraid we will not find the problem ever.
dpb
dpb 2018-12-19
编辑：dpb 2018-12-20
That the char(10) passed to legend was displayed in the error message as \n is, I think, most interesting...was there really a character substitution done in the passed-in string or is it just a fignewton of the error string handling formatting the byte to the string???
As in your tests, all expected-to-work perturbations worked here w/ R2014b, 16b, 17b, 18b
Since a re-install made OP's symptoms disappear, could possibly be related to a behind-the-scenes OS update...but you're right, we'll almost certainly never know for sure.

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