average of a matrix
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From: antonio ferreira on 16 Jul 2010 09:05 Hi all, I am trying to do an average of all lines of a matrix (vel_u_filt)[600*103]. In some positions of the matrix I have NaN values. At the end I would like to have a [600*1] matrix. For this purpose I have written the following part of a code that it`s not working correctly. Can anyone give me a hint in order to do what I pretend. Regards sum=0; cont=0; for i=1:size(vel_u_filt,1) for j=1:size(vel_u_filt,2) if isnan(vel_u_filt)== 0 sum(i)=sum+vel_u_filt; cont(i)=cont+1; end end end vel_u_DA=sum(i)/cont(i);
From: us on 16 Jul 2010 09:13 "antonio ferreira" <edgar.acferreira(a)gmail.com> wrote in message <i1ple3$qrr$1(a)fred.mathworks.com>... > Hi all, > > I am trying to do an average of all lines of a matrix (vel_u_filt)[600*103]. In some positions of the matrix I have NaN values. At the end I would like to have a [600*1] matrix. For this purpose I have written the following part of a code that it`s not working correctly. Can anyone give me a hint in order to do what I pretend. Regards > > sum=0; > cont=0; > for i=1:size(vel_u_filt,1) > for j=1:size(vel_u_filt,2) > if isnan(vel_u_filt)== 0 > sum(i)=sum+vel_u_filt; > cont(i)=cont+1; > end > end > end > > vel_u_DA=sum(i)/cont(i); a hint: - if(f) you own the stats tbx... help nanmean; us
From: Andy on 16 Jul 2010 09:15 "antonio ferreira" <edgar.acferreira(a)gmail.com> wrote in message <i1ple3$qrr$1(a)fred.mathworks.com>... > Hi all, > > I am trying to do an average of all lines of a matrix (vel_u_filt)[600*103]. In some positions of the matrix I have NaN values. At the end I would like to have a [600*1] matrix. For this purpose I have written the following part of a code that it`s not working correctly. Can anyone give me a hint in order to do what I pretend. Regards > > sum=0; > cont=0; > for i=1:size(vel_u_filt,1) > for j=1:size(vel_u_filt,2) > if isnan(vel_u_filt)== 0 > sum(i)=sum+vel_u_filt; > cont(i)=cont+1; > end > end > end > > vel_u_DA=sum(i)/cont(i); vel_u_filt(isnan(vel_u_filt)) = 0; % replace NaNs with 0 rowmeans = mean(vel_u_filt,2); % calculate means along the rows
From: Andy on 16 Jul 2010 09:17 Whoops. I misread how you wanted to handle NaNs. You should use nanmean, as us suggested.
From: antonio ferreira on 16 Jul 2010 09:39
"Andy " <myfakeemailaddress(a)gmail.com> wrote in message <i1pm4h$ci2$1(a)fred.mathworks.com>... > Whoops. I misread how you wanted to handle NaNs. You should use nanmean, as us suggested. I tried to use the function nanmean for a simple example but it´s not working correctly. I am receiving a message saying:Undefined function or method 'nanmean' for input arguments of type 'double'. The example: A=[1 2 3;4 5 NaN;7 8 NaN] B=nanmean(A) Any suggestions?regards |