multiple text files into one in a for loop

4 次查看（过去 30 天）
Chris Murchison
Chris Murchison 2021-2-24
回答： Divya Gaddipati 2021-4-12
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
  3 个评论
显示 1更早的评论
Rik
Rik 2021-2-24
I never work with tables, so I would have to do the same thing as you: either look through the documentation, or try [P1;P2], or see if it is easier to read the files and merge the text output.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Divya Gaddipati
Divya Gaddipati 2021-4-12
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

类别

在 Help Center 和 File Exchange 中查找有关 Data Import and Export 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by