hello i need an if function that tells matlab to reject a certain value and continue to the next one under a condition

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omar mahallawy 2019-2-21

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https://ww2.mathworks.cn/matlabcentral/answers/446331-hello-i-need-an-if-function-that-tells-matlab-to-reject-a-certain-value-and-continue-to-the-next-one

评论： omar mahallawy 2019-2-24

for example if

TEL =

1.0e+04 *

2.2786 1.7122 1.3066 1.0110 0.7922 0.6278 0.5027 0.4063 0.2723 0.1880 0.1331 0.0964 0.0712

2.2558 1.6950 1.2935 1.0009 0.7842 0.6215 0.4976 0.4022 0.2696 0.1861 0.1318 0.0955 0.0705

2.2330 1.6779 1.2805 0.9908 0.7763 0.6152 0.4926 0.3982 0.2668 0.1842 0.1305 0.0945 0.0698

2.2102 1.6608 1.2674 0.9807 0.7684 0.6089 0.4876 0.3941 0.2641 0.1823 0.1291 0.0935 0.0691

2.1874 1.6437 1.2543 0.9706 0.7605 0.6026 0.4825 0.3901 0.2614 0.1805 0.1278 0.0926 0.0684

2.1646 1.6265 1.2413 0.9605 0.7525 0.5964 0.4775 0.3860 0.2587 0.1786 0.1265 0.0916 0.0676

i want matlab to compare the first value in each iteration with a number let's just say 1080 so..

if TEL>1080

reject it and move on to the next iteration.

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Answer 1

Image Analyst 2019-2-22

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https://ww2.mathworks.cn/matlabcentral/answers/446331-hello-i-need-an-if-function-that-tells-matlab-to-reject-a-certain-value-and-continue-to-the-next-one#answer_362166

What iteration??? Is this in a while or for loop???

By first value do you mean TEL(1)?

Please clarify!

Maybe you want to use if and continue to compare EVERY value of TEL with 1080????

for index = 1 : length(TEL)
    if TEL(index) > 1080
        % Skip remainder of loop and pick up with the next index.
        continue; 
    end
    % Code to do if TEL <= 1080.....
end

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omar mahallawy 2019-2-22

sorry if i wasn't clear,

you see TEL is in a for loop that is calculated several times, to be more specific 13 times.

if the first value of the 13 times is bigger than MaxHead i want matlab to ignore it completly and not plot it.

if it's less than MaxHead i want matlab to show it and plot it.

MaxHead=((90*10.^5)./(rough.*g))

Hpump=Hloss+Ze-Zs

LC=1:3200:320000;

for i=1:length(LC)

HlossN=((Fn.*LC(i).*Q.^2)./(12.*Do.^5))

TEL(i,:)=(Hpump-HlossN+Zs)

end

Image Analyst 2019-2-22

So TEL is a 2D array and you want to check the first column in each row to see if it's more than MaxHead. Then do the first loop 13 times until you have finished creating TEL. Then try

for row = 1 : size(TEL, 1)
    % Check if first element in this row is more than MaxHead.
    % If it it, skip this loop and check the next row.
    if TEL(row, 1) > MaxHead
        % Skip remainder of loop and pick up with the next index.
        continue; 
    end
    % Code to do if TEL <= MaxHead.....
end

Of course you could put this into the first loop if you want - it depends on what else happens in your first loop and if that needs to happen before checking the value of TEL, or not.

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