Undefined function or variable error

Hi Guys,

I am a noob in Matlab. I have to calculate different parameters (Bias, BSS, RMSE) alongst a Dune (402 slots) for 250 different profiles. I keep gettint the error Undefined function or variable 'simu'. on the last couple of lines of the Code. I dont know what i am doing wrong...please help?

clear; close all
currentFolder = pwd;
ncFil = fullfile(pwd,'xboutput.nc');
x= nc_varget(ncFil,'globalx');
y= nc_varget(ncFil,'globaly');
zb= nc_varget(ncFil,'zb');
zb_post = load('C:\Users\matth\Desktop\XBeach_MPI\v00_default\POSTmeas\XB_HuMo_POST_nx403ny251_ang326.dep');
zb_ref= load('C:\Users\matth\Desktop\XBeach_MPI\v00_default\Sim\XB_HuMo_FELDENS_OptDep_Dx11-4_Dy4_nx403ny251_ang326_wd-25.dep');

%ny=250
%nx=402

BSS = zeros(250,1) * NaN;
BIAS = zeros(250,1) * NaN;
RMSE = zeros(250,1) * NaN;
 
 
for i = 1:250
            BSS_i  = 0;
			Bias_i = 0;
			RMSE_i = 0;
for j = 1:402
 
if nanmean(zb_post(i,j)) == 1
simu = squeeze(zb(end,i,:));
mess = squeeze(zb_post(i,:)).';
ref = squeeze(zb_ref(i,:)).';

end
end
 
%Variablen belegen
 
BSS(j,1)  = 1 - (sum((simu-mess).^2)/length(simu))/(sum((ref-mess).^2)/length(ref));
Bias(j,1) = sum((simu(:)-mess(:)))/numel(simu);
RMSE(j,1) = sqrt(sum((simu(:)-mess(:)).^2)/numel(simu));

end

Answer 1

[Adam Danz]

'simu' and other variables are only defined when nanmean(zb_post(i,j)) == 1. If that nanmean() is not equal to exactly 1, 'simu' and other variables are never defined. To fix that, define simu, mess, & reff when the nanmean is not equal to 1.

        if nanmean(zb_post(i,j)) == 1
            simu = squeeze(zb(end,i,:));
            mess = squeeze(zb_post(i,:)).';
            ref = squeeze(zb_ref(i,:)).';
        else
            simu = ???
            mess = ???
            ref = ???
        end