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

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.

Answer 1

[Image Analyst]

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

[omar mahallawy]

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]

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.

Answer 2

[omar mahallawy]

no, sir

the first value in each column, if the first value in each column is more than MaxHead then skip the whole row and move on to the next column.

[Image Analyst]

Please attach your TEL and Maxhead in a .mat file. Create the mat file like this:

save('answers.mat', 'TEL', 'MaxHead');

then attach it with the paper clip icon so I can try things.

[omar mahallawy]

Unable to write file answers.mat: permission denied.

TEL is on line 51

Max Head is on line 40

[Image Analyst]

Then try

save('c:/someFolderYouCanWriteTo/answers.mat', 'TEL', 'MaxHead');

[omar mahallawy]

there you go

[omar mahallawy]

i just need to know how can i extract the columns based on a condition

the condition is (if the first value in the column is less than or equal to MaxHead then extract the whole column)