if [0 3 5 10] then first text box should be green, all the rest red. If [3 0 5 10] then second text box should be green. In following code, the color is not changing with change in number.

function fig2n(x,figure1)
figure1=figure;
red=[1 0 0];
green=[0 1 0];
yellow=[1 .8 0];
% drawnow
x=[3 0 5 10];

if x(1)==0<=x(1)<=2
    light1=green;
elseif x(2)==3<=x(2)<=4
    light1=red;
elseif x(3)==5<=x(3)<=6
    light1=red;
elseif x(4)==7<=x(4)<=10
    light1=red;
end

if x(1)==3<=x(1)<=4
    light2=red;
elseif x(2)==5<=x(2)<=6
    light2=red;
elseif x(3)==7<=x(3)<=10
    light2=red;
elseif x(4)==0<=x(4)<=2
    light2=green;
end

if x(1)==5<=x(1)<=6
    light3=red;
elseif x(2)==7<=x(2)<=10
    light3=red;
elseif x(3)==0<=x(3)<=2
    light3=green;
elseif x(4)==3<=x(4)<=4
    light3=red;
end

if x(1)==7<=x(1)<=10
    light4=red;
elseif x(2)==0<=x(2)<=2
    light4=green;
elseif x(3)==5<=x(3)<=6
    light4=red;
elseif x(4)==3<=x(4)<=4
    light4=red;
end

annotation(figure1,'textbox',...
    [0.38 0.46 0.03 0.067],...
    'String',{x(1)},...
    'FitBoxToText','on','FontWeight','bold',...
    'EdgeColor','none','BackgroundColor',[1 1 1],'Color',light1);

annotation(figure1,'textbox',...
    [0.48 0.35 0.03 0.067],...
    'String',{x(2)},...
    'FitBoxToText','on','FontWeight','bold',...
    'EdgeColor','none','BackgroundColor',[1 1 1],'Color',light2);

annotation(figure1,'textbox',...
    [0.58 0.46 0.03 0.067],...
    'String',{x(3)},...
    'FitBoxToText','on','FontWeight','bold',...
    'EdgeColor','none','BackgroundColor',[1 1 1],'Color',light3);

annotation(figure1,'textbox',...
    [0.48 0.57 0.03 0.067],...
    'String',{x(4)},...
    'FitBoxToText','on','FontWeight','bold',...
    'EdgeColor','none','BackgroundColor',[1 1 1],'Color',light4);

   end

[John D'Errico]

I formatted your code for your to make it readable. Please do so yourself in the future.

[Image Analyst]

Please read this. Also, you might like to use control-a control-i in the MATLAB editor to clean up the formatting before you paste it in here.

Answer 1

[John D'Errico]

Please learn to use the code formatting button. Your code will be unreadable otherwise, and it takes only one click of the mouse to do!

To answer your question...

if x(1)==0<=x(1)<=2 light1=green;

This, while it is executable in MATLAB, does NOT do what you think it does. You think of that as a set of equalities and inequalities.

In fact, what MATLAB does is parse it as...

if ((x(1)==0)<=x(1))<=2 light1=green;

So, MATLAB does the first test, i.e., (x(1)==0).

The result of that will be either true(1) or false(0). Then it compares that numeric value to x(1). Again, the test will be either true(1) or false(0), which it then compares to the number 2.

But both of 0 or 1 will ALWAYS be less than the number 2. So no matter what x is, those tests will ALWAYS evaluate to true!

Instead, I think you wanted to write this as:

if (x(1)==0) && (0<=x(1)) && (x(1)<=2), light1=green;

The same applies to all of your other if statements. Just because you tend to use a shorthand notation for mathematics does not always mean that MATLAB will understand that notation.