problem with graphics to use surf()

Hi all,

I am trying to create the graphics using the surf () command but it is generating an additional surface, as if I were joining the starting point with the end

The expression that I am using is this

clc
clear all

x1=load('potencial.txt');
x2=load('velocidad.txt');
x3=load('temperatura.txt');

cor1=x1(:,1);
cor2=x1(:,2);

poten=x1(:,3);
poten_anal=x1(:,4);

vel=x2(:,3);
vel_anal=x2(:,4);

temp = x3(:,3);
temp_anal = x3(:,4);

nn = length(poten);

[X,Y]=meshgrid(cor1,cor2);
Tpot=griddata(x1(:,1),x1(:,2),x1(:,3),X,Y,'cubic');
Tvel=griddata(x2(:,1),x2(:,2),x2(:,3),X,Y,'cubic');
Ttemp=griddata(x3(:,1),x3(:,2),x3(:,3),X,Y,'cubic');

figure (1)
surf(X,Y,Tpot)
title('Potencial')
figure (3)
surf(X,Y,Tvel)
title('Velocidad')
figure (4)
surf(X,Y,Ttemp)
title('Temperatura')

As you can see, an additional blue surface is plotted, which is not why it is generated.

It would be very helpful if you could help me with this.

[Walter Roberson]

We may need the data.

[Denis Alberto Castro Rodriguez]

hello the platform is not letting me attach the .txt files where the data is. You know how I can attach them

[Walter Roberson]

You can zip and attach that.

[Denis Alberto Castro Rodriguez]

Estos son los datos usados

Answer 1

[Walter Roberson]

cor2 is periodic. It ends up starting and ending at 0. You use it to form the Y coordinates, and in so doing accidentally ask the plot to return to y = 0 .

I recommand

N = 50;   %how refined
cor1 = linspace( min(x1(:,1)), max(x1(:,1)), N);
cor2 = linspace(min(x1(:,2)), max(x1(:,2)), N);

[Denis Alberto Castro Rodriguez]

Hola te agradesco mucho por tu colaboracion, utilice tu sugerencia y corregi el error.

Los datos y programcion yo los realizo en Intel FORTRAN, en visual studio de alli mi dificultades en manejar matlab.

Muchas gracias