How to skip [] when add values to a vector variable?

2018 12 5
2 个回答
更新时间：2018 12 6
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0 个投票

How to avoid having to put [] around the values that are going into the vector variable when using input command?
for i = 1:n;
values=input('Enter a value [x y]: ');
point=[point; values]
end
Enter a point [x y]: 2 2
Error using askpoints (line 7)
Error: Invalid expression. Check for missing multiplication operator, missing or
unbalanced delimiters, or other syntax error. To construct matrices, use brackets
instead of parentheses.

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回答（2 个）

madhan ravi
madhan ravi 2018-12-5
编辑：madhan ravi 2018-12-5

0 个投票

% Just alter the below lines in your code
points=cell(1,n); % before loop
points{i}=values; %inside loop
cell2mat(points) %outside loop

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Fille
Fille 2018-12-5
Hi,
Thanks for the quick answer.
Still some issue
part of the function
points=cell(1,n);
for i = 1:n;
values=input('Enter a point [x y]: ');
points{i}=values;
i=i+1;
end
cell2mat(points)
Enter a point [x y]: 2 2
Error using function (line 4)
Error: Invalid expression. Check for missing multiplication operator, missing or
unbalanced delimiters, or other syntax error. To construct matrices, use brackets
instead of parentheses.
Fille
Fille 2018-12-5
Added 's'
values=input('Enter a point [x y]: ','s');
madhan ravi
madhan ravi 2018-12-5
give input as shown
[2 2]
reshape([points{:}],[],2) % change last line to this also remove i=i+1;
Fille
Fille 2018-12-6
Hi,
Have realized that I have to have a matrix instead of vector. ie every input must be on own line
Example:
1 1 input 1
2 2 input 2
3 3 input 3
Do I have to use another way of converting string to the values to the matrix?
madhan ravi
madhan ravi 2018-12-6
values=input('Enter a point [x y]: ')*[ones(1,2)]

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Stephen23
Stephen23 2018-12-5
编辑：Stephen23 2018-12-5

0 个投票

str = input('Enter values x y: ','s');
vec = sscanf(str,'%f')

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Fille
Fille
2018-12-5

评论：

madhan ravi
madhan ravi
2018-12-6

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