Separate string and perform math operations in Matlab

4 次查看（过去 30 天）
Francisco
Francisco 2016-3-14
评论： Francisco 2016-3-15
Hello I have the following problem:
I have the string
num1 = '02 12 28.27'
I would like to perform operations with the numbers separately but first I need to separate the numbers, for example:
num_1 = 02
num_2 = 12
num_3 = 28.27
I was trying the following:
c = textscan(num1,'%f %f %f', 'Delimiter', ' ')
num1 = c{1}
num2 = c{2}
num3 = c{3}
I just got an empty vector.
Thanks in advance for your help!
  1 个评论
Adam
Adam 2016-3-14
That is strange. If I run your code I get exactly what you are looking for. I wouldn't recommend going down the road of 3 named variables (I would use an array of num(1), num(2), num(3) instead), but that is a different matter entirely!

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

dpb
dpb 2016-3-14
Something's going in what what isn't shown; namely the actual code inline with the results instead of piecemeal describing what you think happened. As Adam notes, your input as given works fine although also as he says I'd do it somewhat differently...
>> num1 = '02 12 28.27';
>> cell2mat(textscan(num1,'%f','collectoutput',true))
ans =
2.0000
12.0000
28.2700
>>
Unless there's an embedded non-displaying character in your string other than \b, it appears your code should function albeit with the result of a cell array which is most easily overcome as noted by instead using 'collectoutput' to group into a single array and cell2mat to dispense with the cell array entirely from the git-go when it's not needed or wanted. Note there's no need to specify the delimiter specifically for the default set of whitespace but if it's a character other than blank by doing so you've caused a failure. But, what you pasted is a blank; what we can't tell is whether that's the case in the real instance.
Alternatively, for simple parsing such as this, str2num is less coding effort...
>> str2num(num1)
ans =
2.0000 12.0000 28.2700
>>
str2double, otoh, won't handle the multiple values in a string variable of a single line; it needs them to be a cellstring array or a single value if character string.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Characters and Strings 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by