Why character or string array cannot be constructed like numerical array?
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For eample:
a=[]; a(1:3)=1
but you cannot make string of character the same way:
a=[]; a(1:3)="er"
it returns:
a =
NaN NaN NaN
or
a=[]; a(1:3)='er'
returns this error:
Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.
Any idea to make string or character array?
2 个评论
KSSV
2020-4-2
Read about Cell. YOu can make cell of sting arrays.
Zeynab Mousavikhamene
2020-4-2
采纳的回答
Steven Lord
2020-4-2
You have to start with the correct type of array.
a = "";
a(1:3) = "er"
2 个评论
This is not really equivalent, because
a = "";
actually defines a scalar string array (i.e. one element string (with no characters)), whereas
a = [];
defines an empty double (not a scalar double). To allocate an empty string array use:
a = string([]);
(the MATLAB documentation is very inconsistently written on this topic, sometimes describing "" as an "empty string" (which it isn't, it is scalar), whereas in other places one element strings are clearly described as scalar and also correctly and clearly states that "" defines a "scalar string". So apparently TMW have just proven that 0==1. I shudder to think of the justification that was invented for calling a 1x1 string "empty"...)
James Tursa
2020-4-2
And apparently a third category of this is <missing>. E.g.,
>> clear a
>> a(2) = "er"
a =
1×2 string array
<missing> "er"
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