bypass an "if" within another using a flag

Hi everyone,

I have the code below:

a=5; b=4; c=3; d=2;
if a>b
    if b>c % ====> this 
        if c>d
            disp('i''m in!') 
        end
    end % ======> this
end

Is it possible I bypass the " if b>c" using a flag?

e.g. FLAG=1, include this if, and FLAG=0, bypass this if.

Thanks!

Answer 1

[Walter Roberson]

You might mean either of two different things:

First possibility:

a=5; b=4; c=3; d=2;
if a>b
    if FLAG == 1 && b>c 
        if c>d
            disp('i''m in!') 
        end
    end % ======> this
end

In the above case, if b>c is only tested if FLAG is 1 -- but c>d is not tested if FLAG is not 1.

Second possibility:

a=5; b=4; c=3; d=2;
if a>b
    if FLAG ~= 1 || b>c 
        if c>d
            disp('i''m in!') 
        end
    end % ======> this
end

In this case, the b>c test is only done if FLAG == 1, and if FLAG is not 1, then you go on to c>d anyhow.

[Mehrdad Bahadori]

the second possibility is exactly what I was saying. thanks!

[Image Analyst]

Unless you've left out a lot of code (especially after the b>c block, there is no reason to even enter the a>b block. You could simply do

if a>b && FLAG
    if b>c 
        if c>d
            disp('i''m in!') 
        end
    end % ======> No more code after this block
end

Of course the b>c and c>d could even be combined into a single test sine the c>d is the only thing in the block (again, assuming you have not left out additional code):

if a>b && FLAG
    if b>c && c>d
        disp('i''m in!') 
    end % ======> No more code after this block
end

Answer 2

[Image Analyst]

Since the b>c test occurs only inside the a>b block, and it's the only thing in the a>b block, you could simply do

if a>b && b>c
    if c>d
        disp('i''m in!') 
    end
end

[Mehrdad Bahadori]

thanks for your response.

In the way you are saying, if b>c, it goes to next loop and shows the disp message. What I want is, to bypass the b>c, and go to the next if, and the go to disp.

with a flag , I want to change the code that I posted to the one below functionally:

(e.g. if FLAG==1)

a=5; b=4; c=3; d=2;
if a>b
    % if b>c 
    if c>d
        disp('i''m in!') 
    end
    %    end 
end

Is it possible to do so?