How to plot these functions?

Hello, everyone.

I am trying to plot this function but I can not do it. I got some errors, this is the function that I have to plot. Please someone help me.

By the way, thanks.

Here you have my code:

And the command window responses:

Answer 1

[Image Analyst]

I hope this isn't your homework (or else it would be unethical for you to turn this code in). You can do this:

clc; % Clear the command window.
close all;
workspace; % Make sure the workspace panel is showing.
fontSize = 20;

% Create x and y
x = linspace(0.3, 0.7, 500);
y = linspace(0.3, 0.7, 500);
% Create image
rows = length(y);
columns = length(x);
z = zeros(rows, columns);
for row = 1 : rows
  thisY = y(row);
  for col = 1 : columns
    thisX = x(col);
    if thisX > 0.3 && thisX < 0.5 && thisY > 0.3 && thisY < 0.5
      z(row, col) = (10*thisX-3)*(10*thisY-3)/4;
    elseif thisX > 0.3 && thisX < 0.5 && thisY > 0.5 && thisY < 0.7
      z(row, col) = (10*thisX-3)*(7-10*thisY)/4;
    elseif thisX > 0.5 && thisX < 0.7 && thisY > 0.3 && thisY < 0.5
      z(row, col) = (7-10*thisX)*(10*thisY-3)/4;
    elseif thisX > 0.5 && thisY > 0.5
      z(row, col) = (7-10*thisX)*(7-10*thisY)/4;
    end
  end
end
imshow(z, [], 'XData', x, 'YData', y);
colorbar;
colormap(parula(256));
axis on;
xlabel('X', 'FontSize', fontSize);
ylabel('Y', 'FontSize', fontSize);

[Luis Raves]

Holy Jesus, Thank you so much! It is going to help me a lot! I have a new question: Why do you think that is unethical for me? Is it kind of hard or easy? :D

[Image Analyst]

Well, if it's homework, you're supposed to turn in your own work, not just ask someone else to do it for you and turn in their work. The code was very very simple and basic. For further reading: http://www.mathworks.com/matlabcentral/answers/8026-best-way-s-to-master-matlab

and http://www.mathworks.com/matlabcentral/answers/8626-how-do-i-get-help-on-homework-questions-on-matlab-answers

[Luis Raves]

Well, it's homework, I was trying to do it for a long time without results, and I was looking for help, your code is going to help me with other Implications that I have to code. This is my first question here in the forum but for the next times I'm gping to make it better. If I bothered you I ask you an apology. Thank you for your attention. :D

Answer 2

[Image Analyst]

I don't think you'd plot it. Since x and y both vary, I think you'd create an image and use imshow() to display the values. Or use surf() if you want a 2.5-D perspective view.

[Luis Raves]

Thanks to answer. I refreshed the question and I put the code in this time, can you check it?