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how to replace NaN values with zero?

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Puspa patra
Puspa patra 2018-12-31
编辑： hxen 2023-11-29
Hello,
I have a matrix of 361*181 dimention, which contain NaN and some values.
I want to replace those NaN values with 0, I have tried A(isnan(A))=0; command but is showing error.
the error read as " Subscript indices must either be real positive integers or logicals".
can anyone help me out this?

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madhan ravi
madhan ravi 2018-12-31
编辑：madhan ravi 2018-12-31
Might happen that your isnan is somehow a variable maybe try the following:
clear all
A(isnan(A))=0;
%%%% an example
A=rand(3);
A([2 3],2)=NaN;
A(isnan(A))=0;
Gives:
A =
0.7339 0.8422 0.1934
0.0039 0 0.3316
0.1183 0 0.6213
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Ashishkumar Gupta
Ashishkumar Gupta 2023-1-5
@madhan ravi
Tried ur code for my problem (https://de.mathworks.com/matlabcentral/answers/1889142-how-to-remove-nans-from-struct) but did not work out!!
I want to replace all the NaN with 0 so that size is same for future use.
hxen
hxen 2023-11-29
编辑：hxen 2023-11-29
Ashishkumar Gupta The png attachments in your linked post are not informative. It might be you are not accessing the structure data correclty to get the value you wish to set to zero.
For example, you have a struct named WS_struct with several fields. To access the values (and assuming they are numeric), you would type: WS_struct.HP_EDU_00571_eTA
Just be sure that the fields give numeric data and you correctly access the data. The data fields in the other pic are double, so the method outlined about should work and you can explore with this code how to manipulate the struct fields and set to new named varibles and access entries:
%% example code to set all nan entries to zero after accessing from a struc file
clear all; clc;
M = 5*rand(5,5); % make a 5x5 matrix with random nums on [0,5]
n = randi([1 3],1); % rand num from 1 to 3 to use as the num of nans
randRows = randi([1 5],n,1); % get n rand rows from the 5 cols
randCols = randi([1 5],1,n); % get n rand cols from the 5 cols
fprintf('\nA random 5x5 matrix with 1 to 9 random nan entries:\n');
M(randRows,randCols) = nan
% Now create a structure with field randM and set to M
S.randnum = n;
S. randRows = randRows
S. randCols = randCols;
S.randM = M;
save('randomMatrix.mat','S'); % save structure S
% clear all memory and access data directly from struct S
clear all; % mimicking someone handing you the structure for the first time
load randomMatrix.mat
% set matrix newM to S.randM
newM = S.randM;
fprintf('\nSetting all nan entries to zero:\n');
newM(isnan(newM)) = 0 % find nan entries and set to zero

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