Why does the first value in loop get overwritten

For some reason when fi == 1, NPV_list(1,1) is inserted correctly, but when fi=2 the value gets overwritten, which i dont understand... at all. This is the code:

clear all;
clc;

Fi = [0,0.8:0.05:1];
T = 160;

NPV_list = NaN(length(Fi),1);
for fi = 1:length(Fi);
    fi
    F = Fi(fi);
    load (['res_us_v15_',num2str(T),'_',num2str(100*F)]) 
    NPV_list(fi,1) = us.sim.NPV_Pb_Wlth_avg
    clearvars -except NPV_list Fi T;
end

Can someone explain this? This is the output for first 2 iterations:

      fi =

           1

    NPV_list =

        9.9570
           NaN
           NaN
           NaN
           NaN
           NaN

    fi =

         2

    NPV_list =

        9.8664
           NaN
           NaN
           NaN
           NaN
           NaN

Answer 1

[per isakson]

No, I cannot explain. However, what else is in the files you load? The clearvars looks scary to me.

My function, cssm, works:

    >> cssm()
    ans =
       101   102   103   104   105   106

where

    function    NPV_list = cssm()
        Fi = [0,0.8:0.05:1];
        T = 160;
        us = [ 101 : 109 ];
        NPV_list = NaN(1,length(Fi));
        for fi = 1:length(Fi);
            fi;
            F = Fi(fi);
            NPV_list(1,fi) = us(fi);
            clearvars -except NPV_list Fi T us;
        end
    end

.

Doc says:

    S = load( filename, variables );

Try

    S = load( filename, 'us' );

and remove clearvars.

Last, check whether there is a variable in the loaded file that explains the behavior you see.

Answer 2

[Richard]

Try

Fi = [0,0.8:0.05:1];
T = 160;
NPV_list = NaN(length(Fi),1);
for fi = 1:length(Fi);
    F = Fi(fi);
    load (['res_us_v15_',num2str(T),'_',num2str(100*F)]) 
    NPV_list(fi,1) = us.sim.NPV_Pb_Wlth_avg
end
clearvars -except NPV_list Fi T;

I wouldn't clear the variables until after the loop. It might be the case that by clearing Fi and T, it cannot read it for loop 2 thus no output.

Answer 3

[Sargondjani]

Thanks guys... normally i never save iteration variables like 'fi' but in this case the files contained "fi = 1". very silly