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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 to store large amounts of data. Here is my code:

If anyone can help it would be greatly appreciated.

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

R1 = y(:,1:3);

R1 = R1';

V1 = y(:,4:6);

V1 = V1';

R2 = y(:,7:9);

R2 = R2';

V2 = y(:,10:12);

V2 = V2';

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

Rik
on 24 Feb 2021

Divya Gaddipati
on 12 Apr 2021

Initialize a table before the loop

You can combine two tables inside the loop in the following way:

T = table(); % Create table with the required variable names

for i=1:IT

% Create table inside the loop to append to the original

Tnew = table();

T = [T; Tnew];

end

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