how can I insert comments into a multiline array creation?
显示 更早的评论
This works
>> p = [...
%%%BEGIN ENTRIES %%%
'a1;', ...
'b;', ...
'c;'
]
p =
a1;b;c;
but commenting out the 'b' line doesn't
p = [...
%%%BEGIN ENTRIES %%%
'a1;', ...
% 'b;', ...
'c;'
]
Dimensions of matrices being concatenated are not consistent.
采纳的回答
Walter Roberson
2017-12-27
p = [...
%%%BEGIN ENTRIES %%%
'a1;', ...
... % 'b;', ...
'c;'
]
Note: ... itself acts as a comment operator for the rest of the line, so you could get away with
p = [...
%%%BEGIN ENTRIES %%%
'a1;', ...
... 'b;', ...
'c;'
]
However this would tend to confuse people as it is not common to use this and readers might not pick up on the fact the rest of the line was a comment.
2 个评论
Andrew Diamond
2017-12-27
Walter Roberson
2017-12-27
... has the side effect of also ignoring the rest of the line, but it has the primary effect of continuing the previous statement.
The portion of the 'b;' line before the % is not commented out, so
p = ['a1;', ...
% 'b;', ...
'c;']
is the same as
p = ['a1;', ...
'c;']
which is not the same as
p = ['a1;', ...
'c;']
The
p = ['a1;', ...
'c;']
version should be looked at as if it were
p = ['a1;', ...
[]
'c;']
which would be the same as
p = ['a1;', []
'c;']
The default within [] is that lines that do not end in continuation are treated as if they had ; at the end of them, so this is
p = ['a1;', [];
'c;']
which is
p = ['a1;';
'c;']
and that fails because the number of columns is not equal.
更多回答（1 个）
Andrew Diamond
2017-12-27
0 个投票
1 个评论
Fergil Mills
2019-7-15
^ Agree w Andrew, thanks so much for posting this answer!
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