The zeros() function creates an array of all zeros. The eye() function creates an identity matrix. The ones() function creates an array of all ones. We have a lot of functions that create arrays. Here 3 is the row number and 1 is the column numberĪnother way of doing it is specifying the product of column index and row index The most common way is to specify the row and column subscripts, such as There are two ways to refer to a particular element in an array. The first element has 2 positions ie column index number and rows index number.Ī = Indexing is the process of selecting an element in an array based on its position in the array. When you want to access selected elements of an array, use indexing. In MATLAB®, every variable is an array that can hold many numbers. Instead, they are performed between two entire matrices.

'Matrix operations,' on the other hand, are not implemented on corresponding elements in the two arrays. In other words, they are element-by-element operations. 'Array operations' are implemented on corresponding elements in the two arrays. In MATLAB, two categories of operations are available between arrays: array operations and matrix operations. The 'a' variable is stored in the workspace, and the terminal will display the output in the command window asĪ = 1 2 3 4 5 6 7 8 9 10 11 12 Array Operations in MATLAB It creates an array variable 'a' having one row and four columns. The second way is to use commas in between elements: The 'A' variable is stored in the workspace, and the terminal will display the output in the command window as: It creates an array variable 'A' with one row and four columns. The first way is to use spaces between elements: MATLAB actually supports n-dimensional matrices, so you can see how this can work for multiple dimensions.In MATLAB, we can create arrays in multiple ways. If your calculation is creating a matrix each time, you would then use a three-dimensional matrix, and so on. So each column might represent one time through your loop.

This would also work if you were calculating a vector each time through the loop and wanted to store it as another column. So this is a very simple example of a technique that is used all the time in MATLAB where you will just take the results and store them in a matrix for easy manipulation and use later.

Now that it's done what we can do is come in here and say Plot (y), and we can see that on the graph here. And each time we keep adding another column to this. And what we'll see by scrolling up through the Command Window here is that at first, we have Y is equal to a 1 by 1, then a 1 by 2, 1 by 3. So every time through the loop now this statement is going to read Y element 1 or 2, or 3, or 4, is going to equal to the same thing it did before. So what we can do is come in here and say I want to make Y into a vector. That isn't going to do very well if we want to plot this data. Now what if we wanted to plot those? Well, every time through this loop we have overwritten the value of Y so we lost, like for instance, 9.528 when we generated 10.857. And we can see we've gone through this loop 10 times and gotten different values of Y. I'm going to run it by hitting F5, which means save and run the current file. So I want to actually see the results of this. So we're going to just have a random number generated-somewhere between 0 and 1-and add it to the current value of I, and end. Now inside of this loop what we're going to do is say Y is equal to I plus rand. What we're going to do is say for I is equal 1 : 10, meaning that we're going to count from 1 to 10. In today's video on MATLAB basics, we're going to show how to store the results of a calculation inside of a vector, which is a special case of a matrix.

Store vectors in matrix matlab