auto update of text in plot

i have a plot for sigma =0.05. i want the text in the plot should display sigma = 0.03 when i change the value of sigma as 0.03 and save it as new png file as sigma=0.03

sigma=0.05

me3=rand(1,2000);

me3d=rand(1,2000);

X=1:2000

plot(X, me3, '-*', 'Color', 'red', 'LineWidth', 2, 'MarkerIndices', 1:1000:length(me1))

hold on

plot(X, me3d, '-*', 'Color', 'blue', 'LineWidth', 2, 'MarkerIndices', 1:1000:length(me1))

text(1000, 0.55, '\sigma = 0.05', 'FontSize', 14, 'FontWeight', 'bold')

ylabel(' eigen frequencies', 'FontWeight', 'bold', 'FontSize', 16)

xlabel('Sample size', 'FontWeight', 'bold', 'FontSize', 16)

set(gca, 'FontSize', 16, 'FontWeight', 'bold')

saveas(gcf, 'mean sigma = 0.05.png')

[Mann Baidi]

How are you planning to change the value of "sigma"?

Answer 1

[Dyuman Joshi]

Convert the script to a function (make appropriate change accordingly in doing so) and call the function for different values of sigma -

for sigma = [0.03 0.05]
    myfun(sigma)
end

%Check the contents of the current folder
ls

'mean sigma = 0.03.png'  'mean sigma = 0.05.png'

%Function
function myfun(sigma)
me3=rand(1,2000);
me3d=rand(1,2000);
X=1:2000;
figure
plot(X, me3, '-*', 'Color', 'red', 'LineWidth', 2, 'MarkerIndices', 1:1000:length(me3))
hold on
plot(X, me3d, '-*', 'Color', 'blue', 'LineWidth', 2, 'MarkerIndices', 1:1000:length(me3))
text(1000, 0.55, sprintf('\\sigma = %0.2f', sigma), 'FontSize', 14, 'FontWeight', 'bold')
ylabel(' eigen frequencies', 'FontWeight', 'bold', 'FontSize', 16)
xlabel('Sample size', 'FontWeight', 'bold', 'FontSize', 16)
set(gca, 'FontSize', 16, 'FontWeight', 'bold')
saveas(gcf, sprintf('mean sigma = %0.2f.png', sigma))
end

Changes made -

Generalised the text to be displayed on the plot and filename of the image to be saved as, by including sprintf().