Error in variogramfit.m function use

I would like to ask a question about a code. Especially for the use of variogramfit.m function [fits different theoretical variograms to an experimental variogram].

I would like to vreate a semivariogram My data are 3 columns of a file (x,y,z) . I ve tried the folllowing

clc
clear

filename1= 'C:\Users\hp\Desktop\test.csv'; %input

[d1,tex]= xlsread(filename1);
y=d1(:,3);
x=d1(:,4);
z=d1(:,5);

figure(5)
variogramfit(x,y,z)

a0 = 15; % initial value: range 
c0 = 0.1; % initial value: sill 
h=d2.val
gammaexp=d.val;
[a,c,n] = variogramfit(h,gammaexp,a0,c0,[],...
    'solver','fminsearchbnd',...
    'nugget',0,...
    'plotit',true);

but command window shows me :

Error using horzcat

Dimensions of arrays being concatenated are not consistent.

Error in variogramfit (line 232)

b0 = [a0 c0 params.nugget];

Error in MYCODE (line 12)

variogramfit(x,y,z)

Could you please help me?

[Jiri Hajek]

Your inputs to the variografit function seem to provoke an error. Since the function is not part of MATLAB distribution, but probably downloaded code from File Exchange, you can easily debug your problem by placing a breakpoint inside that function, to the line causing the error. There, you will be able to see the cause of the error, by looking at the values of data used on that line.

[Ivan Mich]

Excuse me, but I did not understand you. I am importing the variogramfit.m function.

(https://www.mathworks.com/matlabcentral/fileexchange/25948-variogramfit)

Could you please expain me more analytically? Thanking you in advance.

[Torsten]

You have 2D data - as far as I can see, variogramfit only fits 1D data.

[Ivan Mich]

I am using the following codes

figure(5)
a0 = 15; % initial value: range 
c0 = 0.1; % initial value: sill 
h=d.distance; %lag distance
gammaexp=d.val; %?(h)

[a,c,n] = variogramfit(h,gammaexp,a0,c0)

but command window shows me:

Error using fplot (line 84)

Range value must be an increasing real finite 2 element row vector.

Error in variogramfit (line 393)

fplot(@(h) funnugget(b) + b(2),[b(1) max(h)])

could you please help me to separate it?