Return character array with increasing size based on input
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I'm trying to make a cell-array that increases in length and has the previous characters in the following cells + the next letter in the alphabet
the inputs are supposed to be a starting letter and a number that indicates the amounts of cells(and then also the amount of letters in the last cell)
k = input('write startingletter and then number:')
k = a3
g = str2num(k(2:end))
inncell{1,1} = k(1);
inncell{1,2} = g;
outcell = makecell(inncell) %the function makecell
outcell=
{'a'} {'ab'} {'abc'}...
this is the output I need
and this is what I've come up with, but it's not working
% a = 97, z = 122 ASCII
k = input('gimme one letter then one pos. number(exs: a5):','s');
g = str2num(k(2:end));
while isletter(k(1))~= 1 || isempty(g) || g <= 0
%errorcheck if invalid input
disp('----ERROR! input ONE letter THEN ONE POSITIVE number');
k = input('gimme one letter then one pos. number(exs: a5):','s');
g = str2num(k(2:end));
end
inncell{1,1} = k(1);
inncell{1,2} = g;
outcell = makecell(inncell);
function outcell = makecell(inncell)
n = inncell{2};
outcell = cell(1,n);
for i = 1:n
for k = 1:i
if k == 1
outcell{1, i} = char(double(inncell{1}));
else
outcell{1, i} = strcat(char(double(inncell{1}), char(double(inncell{1})+ k-1)));
end
end
end
end
3 个评论
Walter Roberson
2019-3-23
There is a one line solution once you know the starting letter and length ;-)
Nikolai
2019-3-23
Walter Roberson
2019-3-23
It is not one function, it is a single expression.
Hint:
10 11 12 13 14
10 11 12 13 14
10 11 12 13 14
10 11 12 13 14
10 11 12 13 14
-->
10 0 0 0 0
10 11 0 0 0
10 11 12 0 0
10 11 12 13 0
10 11 12 13 14
looks like a triangle of entries.
采纳的回答
dpb
2019-3-23
strt=input('Starting letter: ');
N=input('Number groups: ');
% do your error checking here to ensure a single starting character and integer length in reason
...
res=cell(1,N); % preallocate the cell array
res(1)=cellstr(strt); % initial single letter
for i=2:N
res(i)=cellstr(strt:char(strt+i-1));
end
"Brute force, deadahead!" solution of creating each substring independently rather than trying to catenate onto an existing cell...does take advantage of Matlab's ability to do arithmetic on char() arrays/variables that makes things easier to code.
Example:
>> strt='a';
>> N=4;
>> res=cell(1,N);
>> res(1)={strt};
>> for i=2:N,res(i)={strt:char(strt+i-1)};end
>> res
res =
1×4 cell array
{'a'} {'ab'} {'abc'} {'abcd'}
>>
2 个评论
Nikolai
2019-3-23
dpb
2019-3-23
"...could use the colon operator that way with letters"
Yes, a char() array is just an array of characters; they're just integers internally that the display system knows to map to the right displayable characters. But, they can be treated like numbers when convenient, such as here...just have to cast back to the char() type because
>> 'a'+0
ans =
97
>>
changes the type to double...
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