Mapping toolbox. converting asc to tiff file i get NaN values

Hi to all,

i'm trying to convert a .asc file (column matrix) to a .tif file (reshaping it) using Mapping Toolbox. I already used this code without problems but now it create a .tiff file (to open with ArcGIS ) with all values corresponding to NaN (the value is: -3.40282346639e+38 and correspond to matrix NaNvalue in the code). I don't understand how to fix the problem. I got any error. I attached the .asc file here.

This is my code:

%% load data 
    inRoot = 'Ascii_out';  

    Dat1 = csvread(strcat(inRoot,'/','Idx_NaN.asc'));  
    Dat2 = csvread(strcat(inRoot,'/','Rv_median.asc')); 
    
%% setting
    NaNvalue = -3.40282346639e+38;
    Xcor = 1557274.88066;
    Ycor = 4920154;
    CellSize = 100; 
    rowR = 701;
    colR = 1014;
    
%% EXPORT RV MEDIAN MAP
    DATA = Dat2;    %definisce la colonna da cui esportare i dati
    NaNidx = Dat1;
    row = rowR;
    col = colR;
    
    RunVec = 2; %numero di test
    Run = strcat(num2str(RunVec)); %run
    PCtime = clock;
    Date = strcat(num2str(PCtime(1)),num2str(PCtime(2)),...
      num2str(PCtime(3)),'_',num2str(PCtime(4)),...
      num2str(PCtime(5)));
    Path = strcat('output/maps/');
    Root = strcat('MAC_c1_100m',Run);
    OutName ={'_Rv_median'}; 
    OutNameCod =''; %'Rcl_'
    flg1 = 2;
    FXMapExport(DATA,NaNidx,row,col,NaNvalue,Xcor,Ycor,CellSize,Path,...
         Root,OutName,OutNameCod,flg1);

Thanks in advance for any help, it is really important.