Combining if and for loop

Hi all!

I am trying to combine an if and for loop in the same line. From what I have seen, it is not possible to do it directly. I have tried different ways but don't seem to find the correct way to write my code...

To explain: I am using my code to test out wether parts of my data meet certain threshold values. If this value is met, then it should do the function, otherwise test the next threshold and so on. If none of those thresholds are met, it should do the 'else' part where I have defined some other function: 'FunctionElse'.

My problem lies with the 'elseif Acc(i,3) > Threshold3'. What I want to do is for the code to check 2 things. First, I want it to check if Acc(i,3) > Threshold3, which does work. At the same time, I want the code to check if the 20 values before and after are equal to 0. If they are all equal to 0, I want it to do my self defined function 'Up'. However if it is not true, I want the function to go to the last 'else' where I can do my final function: 'FunctionElse'. However this is not working. See code below

for i = 1+2*l:N-2*l
    if Gyr_1(i,3)>Threshold1
        [Acc_2, Gyr_2] = Turn(Acc_1, Gyr_1, k, l); % This is a function I defined
    elseif Gyr_1(i,1)>Threshold2 || Gyr_1(i,2)>Threshold2
        [Acc_2, Gyr_2] = Grad(Acc_1, Gyr_1, k, l); % This is a function I defined
    elseif Acc_1(i,3)>Threshold3 
        for m = -20:20
            if Acc_1(i+m,3) == 0
                Val_Accz = Val_Accz + 0;
            else
                Val_Accz = Val_Accz + 1;
            end
        end
        if Val_Accz == 0
            [Acc_2, Gyr_2] = Up(Acc_1, k, l);
        else
            return % If it is not true, I want the function to go to the next else 
        end
    else
        [Acc_2, Gyr_2] = FunctionElse(Acc_1, Gyr_1, k, l) % Do some other type of function / Should also come here if Val_Accz ~= 0 
    end
end

Can any of you help me with this little problem?

Thank you in advance for your help!

Hope I explained my problem well enough

Samuel :)

Answer 1

[Jan]

I assume you mean:

    elseif Acc_1(i, 3) > Threshold3 && ~any(Acc_1(i-20:i+20, 3))   % [TYPO FIXED]
        [Acc_2, Gyr_2] = Up(Acc_1, k, l);
    else            

But is it really wanted to test Acc_1(i,3) > Treshold3 and Any(i,3)==0 ?

So maybe you want to exclude Acc_1(i,3) from the check for zeros:

        elseif Acc_1(i, 3) > Threshold3 && ...    % [TYPO FIXED]
            ~any(Acc_1(i-20:i-1, 3)) && ~any(Acc_1(i+1:i+20, 3))
        [Acc_2, Gyr_2] = Up(Acc_1, k, l);
    else     

[Samuel Bofferding]

Hi Jan,

I realised, that i made a mistake. I wanted to check if all the values (i-20:i+20) are unequal to 0.

I have tried using the all function:

...
    elseif Acc_1(i,3) > Threshold && all(Acc_1(i-20:i+20), 3)
        [Acc_2, Gyr_2] = Up(Acc_1, k, l);
    else
...
    

Would this be correct? When I use &&, I get "Operands to the || and && operators must be convertible to logical scalar values."

Should I use & instead?

[Jan]

The error comes from a typo in my code. Replace:

all(Acc_1(i-20:i+20), 3)
% by
all(Acc_1(i-20:i+20, 3))

The first one calculates all() over the 3rd dimension, but you want the 3rd column of Acc_1.