covert NaN to zeros

“These will contain the value ‘NaN’ when imported. You should replace these with a value of zero.“ For a given set of data, it contains NaN in some where, how to pick then up and assign a zero to then as stated as the statement?

[dpb]

x(isnan(x))=0;

the most basic of logical indexing.

Answer 1

[John fredson]

Check for incorrect argument data type or missing argument in
call to function 'isnan'.

Error in Q1a (line 16)
x(isnan(X))=0 ;

this error occurs

[Steven Lord]

What type of variable is x? Is it double, like d in the example below? Is it a table array, like t? Is it a cell array like c? Or is it some other type?

d = 1:10;
t = array2table(magic(4));
c = {'apple', 'banana'};
whos

  Name        Size            Bytes  Class     Attributes

  c           1x2               230  cell                
  cmdout      1x33               66  char                
  d           1x10               80  double              
  t           4x4              1759  table               

If it's either double or table, I'd use fillmissing instead of assignment with isnan. isnan is not defined for table arrays but fillmissing can fill missing data inside a table.

d(5) = NaN

d = 1×10

1 2 3 4 NaN 6 7 8 9 10

d2 = fillmissing(d, 'Constant', 0)

d2 = 1×10

1 2 3 4 0 6 7 8 9 10

t{2, 3} = NaN

t = 4×4 table
    Var1    Var2    Var3    Var4
    ____    ____    ____    ____

     16       2       3      13 
      5      11     NaN       8 
      9       7       6      12 
      4      14      15       1 

t2 = fillmissing(t, 'Constant', 0)

t2 = 4×4 table
    Var1    Var2    Var3    Var4
    ____    ____    ____    ____

     16       2       3      13 
      5      11       0       8 
      9       7       6      12 
      4      14      15       1 

[John fredson]

it is textdata

Answer 2

[John fredson]

I have a set of struct data, may I know how can I plot it in the subplot?

[Steven Lord]

This doesn't seem to be related to the original question of how to replace NaN values with 0, so you should ask this as a new question (with more details about how the data is organized in your struct.) Use the Ask link just below the blue "MATLAB Answers" bar at the top of the page.

Answer 3

[Image Analyst]

You say you have "text data".

Not sure what you really have, but look at this:

textData = 'abcdef';
textData(3) = nan

textData = 'ab def'

textData(isnan(textData)) = 0

textData = 'ab def'

textData(3)

ans = ' '

textData(3) = '0'

textData = 'ab0def'

Does that do anything like what you want and expect? If not, attach your variable in a .mat file with the paperclip icon after reading this:

TUTORIAL: How to ask a question (on Answers) and get a fast answer

[John fredson]

The question are as follow

[Walter Roberson]

https://www.mathworks.com/help/matlab/ref/fillmissing.html

fillmissing() with constant value 0