multiple text files into one in a for loop

Hi,

I am trying to join multiple text files into one. RIght now, in my code, I have IT number of datafiles but I would like to all combine into one with the rows following on from the previous iteration. The file needs to contain all the columns of data that are shown in the table P. Here is my code:

If anyone can help it would be great;y appreciated.

clc,clear

close all

for IT = 1:50

x1 = -15+30*rand(3,1);

x2 = -15+30*rand(3,1);

N = 2;

r_t = 7000*1000; %km

g_t = 9.8; %m/s2

r = r_t;

g = g_t;

tau_d = 300;

t = 1;

omega = sqrt(g/r);

% target positions

e1 = [1; 1; 0];

e2 = [0; 0; -1];

%parameters and unknowns

mu = 398600.5;

n = sqrt(mu/r_t^3);

b = 0.112;

k1 = 1;

d = 0.037;

k2 = 1;

norm_d = norm(e1-e2);

c = -d/norm_d * exp(-norm_d^2/k2) - b/norm_d*exp(-norm_d^2/k1);

lambda = [b, c, d, k1, k2];

v1_gf = gf_sat_1_vel2(x1, x2, e1, e2, lambda, omega, tau_d, t, N);

v2_gf = gf_sat_1_vel2(x1, x2, e1, e2, lambda, omega, tau_d, t, N);

v10 = [0; 0; 0];

v20 = [0; 0; 0];

y0 = [x1(1); x1(2); x1(3); v10(1); v10(2); v10(3); x2(1); x2(2); x2(3); v20(1); v20(2); v20(3)];

dt=1;

tspan = 0:dt:1000;

[t,y] = ode45(@(t,y)ClohesseyWiltshire(y, n, lambda, e1, e2, omega, tau_d, t, N),tspan, y0);

U1 = zeros(length(t),length(e1));

U2 = zeros(length(t),length(e2));

dv1 = 0;

dv2 = 0;

for i = 1 : length(t)

[u1, u2, vg1, vg2] = ClohesseyWiltshire_u(y(i,:), n, lambda, e1, e2, omega, tau_d, t(i), N);

U1(i, :) = u1;

U2(i, :) = u2;

VD1(i, :) = vg1;

VD2(i, :) = vg2;

U1_norm(i) = norm(u1);

U2_norm(i) = norm(u2);

v1_gf = gf_sat_1_vel2(x1, x2, e1, e2, lambda, omega, tau_d, t(i), N);

V1GF(i, :) = v1_gf;

v2_gf = gf_sat_2_vel2(x1, x2, e1, e2, lambda, omega, tau_d, t(i), N);

V2GF(i, :) = v2_gf;

if i ~= 1

dv1 = norm(u1) * (t(i) - t(i-1)) + dv1;

dv2 = norm(u2) * (t(i) - t(i-1)) + dv2;

end

end

DV = [dv1; dv2];

R1 = y(:,1:3);

R1 = R1';

V1 = y(:,4:6);

V1 = V1';

R2 = y(:,7:9);

R2 = R2';

V2 = y(:,10:12);

V2 = V2';

figure(1)

plot3(R1(1, :), R1(2, :), R1(3, :))

hold on

plot3(R2(1, :), R2(2, :), R2(3, :))

plot3(x1(1),x1(2),x1(3),'o')

plot3(e1(1),e1(2),e1(3),'x')

plot3(x2(1),x2(2),x2(3),'o')

plot3(e2(1),e2(2),e2(3),'x')

hold on

title('Trajectories of Two Satellite Configuration - Gravitational Field')

xlabel('X')

ylabel('Y')

zlabel('Z')

legend({'Satellite 1','Satellite 2'},'Location','Southwest')

V1 = V1';

V2 = V2';

R1 = R1';

R2 = R2';

U1_norm = U1_norm';

U2_norm = U2_norm';

tspan = tspan';

% Create columns of data

% Create a table with the data and variable names

P = table(t, U1, VD1, U2, VD2, V1, V2, R1, R2, V1GF, V2GF, 'VariableNames', {'t', 'U1', 'VD1', 'U2', 'VD2' 'V1', 'V2', 'R1', 'R2', 'V1GF', 'V2GF'});

% Write data to text file

name = ['Database2/',num2str(IT), 'Database.txt'];

writetable(P, name)

end