Output data to text file
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I have this code
H = 1;
h = 15;
l = 500;
g = 9.81;
n1 = 1;
n2 = 2;
n3 = 3;
L1 = (2*l)/n1;
L2 = (2*l)/n2;
L3 = (2*l)/n3;
T1 = (2*l)/(n1*sqrt(g*h));
T2 = (2*l)/(n2*sqrt(g*h));
T3 = (2*l)/(n3*sqrt(g*h));
t = 0;
x = 0:10:l;
k1 = (2*pi)/L1;
k2 = (2*pi)/L2;
k3 = (2*pi)/L3;
sigma1 = sqrt(g*k1*tanh(k1*h));
sigma2 = sqrt(g*k2*tanh(k2*h));
sigma3 = sqrt(g*k3*tanh(k3*h));
eta1 = (H/2)*cos(k1*x)*cos(sigma1*t);
eta2 = (H/2)*cos(k2*x)*cos(sigma2*t);
eta3 = (H/2)*cos(k3*x)*cos(sigma3*t);
figure
hold on
subplot(3,1,1);
plot(x,eta1)
title('n = 1');
subplot(3,1,2);
plot(x,eta2)
title('n = 2')
subplot(3,1,3);
plot(x,eta3)
title('n = 3');
I need to output the data into 3 text files with 2 columns where x = 1,2,3 for three modes respectfully. (n =1,2,3 are modes). How would I go about this?
采纳的回答
William Rose
2021-9-28
On Matlab 2021, use writetable() or dlmwrite(). See help for each.
On Matlab 2018, use dlmwrite(), since writetable() was not yet in Matlab.
Use Matlab's aray capability to shorten your code.
I recommend that you rename variable l to xmax, since l and the numeral 1 look so similar in the Courier font used by Matlab.
Here is code that uses Matlab's array capability and creates the three files you requested.
H = 1;
h = 15;
xmax = 500;
g = 9.81;
n=1:3; %1x3 array
L=2*xmax./n; %1x3 array
T=2*xmax./(n*sqrt(g*h)); %1x3 array
t = 0;
x = 0:10:xmax; %1x51 array
k=2*pi./L; %1x3 array
sigma = sqrt(g*k.*tanh(k*h)); %1x3 array
eta=H/2*cos(k'*x).*cos(sigma'*t); %3x51 array
figure
for i=1:3
subplot(3,1,i);
plot(x,eta(i,:))
titlestr=sprintf('n=%d',i);
title(titlestr);
filename=sprintf('dataout%d.txt',i);
dlmwrite(filename,[x',eta(i,:)']);
end
Good luck with your work.
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