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• Question: delete a row in matlab
• Time: Updated 11 minute ago
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delete a row in matlab

To delete a row in MATLAB, you can use the following syntax:

```matlab```A(row,:) = [];
``````

where `A` is the matrix or array from which you want to delete the row, and `row` is the index of the row you want to delete. The `:` in the second argument means that all columns of the specified row should be deleted.

For example, let’s say you have a matrix `A` with 3 rows and 4 columns, and you want to delete the second row:

```matlab```A = [1 2 3 4; 5 6 7 8; 9 10 11 12];
row = 2;
A(row,:) = [];
``````

After running this code, the matrix `A` will now have 2 rows and 4 columns:

```matlab```A =

1     2     3     4
9    10    11    12
``````

Note that this method modifies the original matrix `A`. If you want to keep the original matrix intact and create a new matrix with the row deleted, you can use indexing to extract the rows you want to keep:

```matlab```A = [1 2 3 4; 5 6 7 8; 9 10 11 12];
row = 2;
A_new = A([1:row-1,row+1:end],:);
``````

This will create a new matrix `A_new` with the second row deleted:

```matlab```A_new =

1     2     3     4
9    10    11    12
``````

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Delete column matlab

To delete a column in MATLAB, you can use the following syntax:

```matlab```A(:,columnIndex) = [];
``````

Where `A` is the matrix or array, and `columnIndex` is the index of the column that you want to delete.

For example, if you have a matrix `A` with three columns and you want to delete the second column, you can use the following code:

```matlab```A = [1 2 3; 4 5 6; 7 8 9];
columnIndex = 2;
A(:,columnIndex) = [];
``````

After running this code, the matrix `A` will have two columns:

```matlab```A =

1     3
4     6
7     9
``````

Note that the column at index 2 (containing elements 2, 5, and 8) has been deleted.

Delete element in array – MATLAB

In MATLAB, you can delete an element from an array using the built-in function `delete`. The `delete` function takes two arguments: the array you want to modify, and the index of the element you want to delete.

Here’s an example:

```css```A = [1 2 3 4 5];
index_to_delete = 3; % delete the third element
A = delete(A, index_to_delete);
``````

After running this code, the value of `A` will be `[1 2 4 5]`, with the third element (the value 3) removed.

Alternatively, you can use indexing to remove an element from an array. Here’s an example:

```css```A = [1 2 3 4 5];
index_to_delete = 3; % delete the third element
A(index_to_delete) = [];
``````

After running this code, the value of `A` will be `[1 2 4 5]`, with the third element (the value 3) removed.

Note that when using indexing to delete an element from an array, the resulting array may have a different size than the original array. This is because the deleted element is removed from the array, and the remaining elements are shifted to fill the gap.

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