Replace String with a NaN in table

2015 3 24
4 个回答
回答已采纳
更新时间：2015 3 24
13 次查看（30 天）

0 个投票

Hey guys!
I am challenged with a table, consisting various numbers and a few "'Bad'" cells. I guess they are strings. My goal now is to replace these "Bads" with NaNs.
How do I achieve that the easiest way?
Best regards, Spacey

请先登录，再回答此问题。

 采纳的回答

Peter Perkins
Peter Perkins 2015-3-24

1 个投票

It sounds like you imported a file where some of the columns were mostly numbers, but some strings mixed in. Best to avoid getting into the corner that you're in. You might have been able to explicitly say that the column is numeric. You might have been able to use the TreatAsEmpty parameter to readtable (if that's what you used).
Otherwise, if you have variables in the table that are cell arrays but that you want to be numeric, you might need to do one of a couple different things. In general, you need to put numeric things in all the cells and then concatenate the contents to get a numeric vector, but first you'll need to describe exactly what you have.

更多回答（3 个）

Konstantinos Sofos
Konstantinos Sofos 2015-3-24
编辑：Konstantinos Sofos 2015-3-24

2 个投票

Hi,
" I guess they are strings" ...you cannot open your table or see in the workspace what type are they?
Do you mean something like the following:
>> A = {'xx',5,6,'''',78,'?..'}
A =
'xx' [5] [6] ''' [78] '?..'
>> idx = cellfun(@(x) ischar(x),A)
idx =
1 0 0 1 0 1
>> A(idx)={NaN}
A =
[NaN] [5] [6] [NaN] [78] [NaN]
>> B = cell2mat(A)
B =
NaN 5 6 NaN 78 NaN
>> whos
Name Size Bytes Class Attributes
A 1x6 408 cell
B 1x6 48 double
Spacey
Spacey 2015-3-24

0 个投票

Unfortunately I couldn't get it working yet. The huge problem is the table. It says that the "'Bad'" values are cells, but many functions don't even work with cells respectively different formats within the table. Do guys have any other ideas or questions that would specify this problem?

类别

在 帮助中心 和 File Exchange 中查找有关 Characters and Strings 的更多信息

产品

标签

Community Treasure Hunt

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

Start Hunting!

Translated by