plot a line at x=31 with [y_min and y_max]

x=[31,31];
y=[0,70000];
plot(x,y)

MATLAB plot of data (spectro) with maximum indicator

load llspectro6.txt
x = llspectro6 (:,1);
y = llspectro6 (:,2);
[Peak, PeakIdx] = findpeaks(y);
plot(x,y, 'cyan', 'Linewidth', 2)
ylabel ('Intensity (Counts)')
xlabel ('Wavelength (nm)')
indexmin = find(min(y) == y);
xmin = x(indexmin);
ymin = y(indexmin);
indexmax = find(max(y) == y);
xmax = x(indexmax);
ymax = y(indexmax);
strmax = ['Maximum = ',num2str(xmax)];
text(xmax,ymax,strmax,'HorizontalAlignment','right');

MATLAB data plotting: x vs y plot and x vs y1,y2,y3 etc. plot in single frame

load plot2.txt

x = plot2 (:,1);

y = plot2 (:,2);

plot(x,y, 'r', 'Linewidth', 2)

title('Magnetization plot of 5x5')

ylabel ('Absolute value of Magnetization |M|')

xlabel ('Temperatuire (T)')

load plot2.txt

load plot2.txt

x = plot2 (:,1);

y1 = plot2 (:,2);

y2 = plot2 (:,3);

y3 = plot2 (:,4);

y4 = plot2 (:,5);

plot(x, y1, 'r', x, y2, 'm', x, y3, 'g', x, y4, 'b', 'Linewidth', 2)

title('Specific heat plot of of four lattice sizes')

ylabel ('Specific heat (Cv)')

xlabel ('Temperatuire (T)')