I have been given an m-file that amongst other things does a bootstrap calculation but I seem to be hitting a brick wall.

Here is the file I am using:

and this is the result:[nz,ntv] = size(obs);

% means

disp(' ')

mobs = mean(obs);

disp (['mean observed values = ' num2str(mobs)])

mest = mean(est);

disp (['mean estimated values = ' num2str(mest)])

% standart deviations

sdobs = std(obs);

disp (['std dev observed values = ' num2str(sdobs)])

sdest = std(est);

disp (['std dev estimated values = ' num2str(sdest)])

% assessment of goodness-of-fit

% correlation and coefficient of determination (explained variance)

[corre,p] = corrcoef([obs est]);R2=corre.^2;

disp (['R2 corre^2 = ' num2str(R2(1,2)) ' p = ' num2str(p(1,2))])

% mean absolute error

imae = sum(abs(obs-est))/ntv;

disp (['mae = ' num2str(imae)])

% root mean square error

rmse = sqrt(sum((obs-est).^2)/ntv);

disp (['rmse = ' num2str(rmse)])

disp(' ')

% Nash-Sutcliffe coeff of efficiency

E = 1-(sum((obs-est).^2)/sum((obs-mobs).^2));

disp (['N-Sut efficiency (E) = ' num2str(E)])

stat = bootstrp(500,@Nash_Sut,obs,est);

[a b]=ci95(stat);

disp ([ 'E 95% ci = ' num2str(a) ' ' num2str(b)])

disp (' ');clear stat

% log Nash-Sutcliffe coeff of efficiency

Elog = 1-(sum((log(obs)-log(est)).^2)/sum((log(obs)-log(mobs)).^2));

disp (['Elog = ' num2str(Elog)])

stat = bootstrp(500,@log_Nash_Sut,obs,est);

[a b]=ci95(stat);

disp ([ 'E 95% ci = ' num2str(a) ' ' num2str(b)])

disp (' ');clear stat

% Modified Nash-Sutcliffe coeff of efficiency

E1 = 1-(sum(abs(obs-est))/sum(abs(obs-mobs)));

disp (['N-Sut efficiency modified (E1) = ' num2str(E1)])

stat = bootstrp(500,@m_Nash_Sut,obs,est);

[a b]=ci95(stat);

disp ([ 'E1 95% ci = ' num2str(a) ' ' num2str(b)])

disp (' '); clear stat

% index of agreement

d = 1-(sum((obs-est).^2)/sum((abs(obs-mobs)+abs(obs-mobs)).^2));

disp (['Index of agreement (d) = ' num2str(d)])

stat = bootstrp(500,@I_agree,obs,est);

[a b]=ci95(stat);

disp ([ 'd 95% ci = ' num2str(a) ' ' num2str(b)])

disp (' '); clear stat

% Modified index of agreement

d1 = 1-(sum(abs(obs-est))/sum((abs(obs-mobs)+abs(obs-mobs))));

disp (['Index of agreement modified (d1) = ' num2str(d1)])

stat = bootstrp(500,@m_I_agree,obs,est);

[a b]=ci95(stat);

disp ([ 'd1 95% ci = ' num2str(a) ' ' num2str(b)])

disp (' '); clear stat

Can anyone help me resolve the problem? It seems that matlab does not like Nash_sut and the rest as a Bootfun.mean observed values = 17.9477

mean estimated values = 17.7683

std dev observed values = 6.4146

std dev estimated values = 2.1859

R2 corre^2 = 0.034055 p = 0.32894

mae = 152.28

rmse = 34.3907

N-Sut efficiency (E) = 0.0088419

??? Error using ==> feval

Undefined command/function 'Nash_Sut'.

Error in ==> bootstrp at 77

thetafit = feval(bootfun,varargin{:});

Error in ==> goodfit2 at 53

stat = bootstrp(500,@Nash_Sut,obs,est);

Secondly, and more to save time, how do I modify the m-file so that instead of running this for every obs and est file I have (there are 50+ of each), I could put them all into one file each ie in columns and get the outputs for each individual column?