## For loop through cell arrays

I have a 1×4 cell array of

{60×4 double} {60×4 double} {60×4 double} {60×4 double}

and I need to;

-find the values at the 3rd column at the rows have "20" at the first column in each cell

-then eliminate zeros if there is any

-then take average

As an illustration

10 NaN 0 NaN 20 NaN 623 1

10 NaN 0 NaN 20 NaN 0 NaN

20 NaN 310 1 10 NaN 38 1

20 NaN 0 NaN 10 NaN 0 NaN

20 NaN 1445 1 10 NaN 0 NaN

the first cell should give the average of 310 and 1445, whereas the second cell should give 623.

I am thinking of a for loop but I couldnt make it work. Thanks in advance!

## MATLAB Iterate Through Matrix

- Iterate Through a Matrix Using Linear Indexing in MATLAB
- Iterate Through a Matrix Using Function in MATLAB
- Iterate Through a Matrix Using Function in MATLAB

This tutorial will discuss how to iterate through a matrix using the linear indexing, , and function in MATLAB.

### Iterate Through a Matrix Using Linear Indexing in MATLAB

In a matrix, there are two kinds of indexing; one is the row and column indexing in which we have to give the row and column number to access an element present in the matrix, second is the linear indexing in which we can access an element using only its linear index. For example, see the code below.

Output:

In the above code, we access the last element of the matrix using both kinds of indexing. In linear indexing, the elements are present in the matrix starting from the first column. So if you count from the first column, the last element is present at the sixth index. In order to iterate a matrix using row and column indexing, you require two loops, but in the case of linear indexing, you only require one loop. For example, let’s iterate through a matrix using linear indexing. See the code below.

Output:

In the above, we used the function to get the total number of elements present in the given matrix. And using a loop and linear indexing, we displayed each element one by one on the command window. Note the sequence by which the elements are displayed on the command window, and this is the sequence of the linear indexing.

### Iterate Through a Matrix Using Function in MATLAB

If you have a function and want to apply it to each element of the array or matrix, one way to do that is to iterate through each element as described above and apply the function on each element, but there is another easy method in which you can use the to apply the given function to each element of the array or matrix. See the code below.

In the above code, the applied the function stored in to each element of the array one by one and store the result in the variable . For example, let’s apply a defined function to each element of a matrix. See the code below.

Output:

As you can see from the output, the function is applied to each element of the matrix, and the result is stored in the variable . Check this link for more information about the .

### Iterate Through a Matrix Using Function in MATLAB

If you have a function and want to apply it to each element of a given cell, one way to do that is to iterate through each element as described above and apply the function on each element, but there is another easy method in which you can use the to apply the given function to each element of the cell. See the code below.

In the above code, the applied the function stored in to each element of the cell one by one and store the result in the variable . For example, let’s apply a defined function to each element of a cell. See the code below.

Output:

As you can see from the output, the function is applied to each element of the cell, and the result is stored in the variable . Check this link for more information about the .

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## MATLAB - The for Loop

A **for loop** is a repetition control structure that allows you to efficiently write a loop that needs to execute a specific number of times.

### Syntax

The syntax of a **for loop** in MATLAB is −

*values* has one of the following forms −

Sr.No. | Format & Description |
---|---|

1 |
increments the index variable from |

2 |
increments |

3 |
creates a column vector |

### Example 1

Create a script file and type the following code −

Live Demo

for a = 10:20 fprintf('value of a: %d\n', a); endWhen you run the file, it displays the following result −

value of a: 10 value of a: 11 value of a: 12 value of a: 13 value of a: 14 value of a: 15 value of a: 16 value of a: 17 value of a: 18 value of a: 19 value of a: 20### Example 2

Create a script file and type the following code −

Live Demo

for a = 1.0: -0.1: 0.0 disp(a) endWhen you run the file, it displays the following result −

1 0.90000 0.80000 0.70000 0.60000 0.50000 0.40000 0.30000 0.20000 0.10000 0### Example 3

Create a script file and type the following code −

Live Demo

for a = [24,18,17,23,28] disp(a) endWhen you run the file, it displays the following result −

24 18 17 23 28matlab_loops.htm

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## Iterate array matlab through

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