How to save a Figure to a PNG File

My code below seems to generate and save the "figure" file. However, when I want to save this to a *.png file I tend to get an error.

How can I save a *.fig file and also generate and save a *.png file? I think I am doing something wrong with the code.

Any help is appreciated.

plot1 = plot(freq,magB_0_AOR00,freq,magB_0_AOR45,freq,magB_0_AOR90,...
    freq,magC_0_AOR00,freq,magC_0_AOR45,freq,magC_0_AOR90); 
title('Data Investigation');
subtitle('A=PT0, B=PT1, C=PT2')
legend('B0^{\circ}','B45^{\circ}','B90^{\circ}',...
    'C0^{\circ}','C45^{\circ}','C90^{\circ}','Location','southwest');
ylabel('Magnitude'); 
xlabel('Frequency (GHz)');
saveas(gcf,'CompileData.fig');

Answer 1

[the cyclist]

According to the documentation for saveas, you should be able to do

saveas(gcf,'CompileData.png')

If that doesn't work, then you could upload your data here, for us to test.

Answer 2

[Sulaymon Eshkabilov]

Here are two different ways how you can save the plot figure output in .png:

F = @(t)exp(sin(2*t));
fplot(F, [-pi, pi])
grid on
% using saveas
OUT_File_Name = 'MY_plot';
saveas(gcf, OUT_File_Name, 'png')

% using exportgraphics()
OUT_File_Name2 = 'MY_plot2.png';
exportgraphics(gca, OUT_File_Name2)