MATLAB: Row Number Returned During Iterations

MATLAB and Simulink Student Suiterow indexing

I have an if statement that goes through all rows looking for a specific condtion.

When the condtion is met, I want to know only what row that condtion was true.

What syntax would return just the rows?

Note: I do not want to use the ismember function as I am using the iteration (row) to referrence another array.

Best Answer

Iterator indicates which row satisfied that condition , so why not save it?

Related Solutions

MATLAB: How to find an element in a matrix that meets a condition then call its entire row

Use find with two output arguments:

N = ...;
[r,c] = find(DT==N);

This is the easiest way, especially if you don’t know the column the value you want is in. Here, ‘r’ is the row and ‘c’ the column of every occurrence of ‘N’.

MATLAB: Saving data during iterations

It seems that you are overwriting y in each iteration. Being that the case, I would create a matrix stored_y to save the values of that variable. Something like this. I tested it by setting i = 1.

x = [1 2 3 4 5]
y= [1.5, 2.5, 3.5, 4.5, 5.5]
stored_y = zeros(11,5); % Data for each iteration is stored on rows.
stored_y(1,:) = y; % Saves "first" value of y. 
for k=1:10
    buff1 = y; 
    for x=1:5
        y(x)=buff1(i)+y(i);
    end
    stored_y(1+k,:) = y; % Saves calculated value of y
    
%    hold on
%    plot(x, y)
end

Now, in order to plot stored_y you could do something like this:

figure
hold on
x=1:5;
for n=1:size(stored_y,1)
    plot(x,stored_y(n,:));
end

Best Answer

Related Solutions

MATLAB: How to find an element in a matrix that meets a condition then call its entire row

MATLAB: Saving data during iterations

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