## Indexing numbers in matlab

Every variable in MATLAB® is an array that can hold many numbers. When you want to access selected elements of an array, use indexing. For example, consider the 4-by-4 magic square A:

Indexing with a Single Index. Another method for accessing elements of an array is to use only a single index, regardless of the size or dimensions of the array. This method is known as linear indexing. While MATLAB displays arrays according to their defined sizes and shapes, they are actually stored in memory as a single column of elements. Indexing Arrays. Indexing into Matlab arrays is very often glossed over, but it is actually quite a powerful (and fast) technique. There are a surprising number of things that can be done by just indexing into a Matlab array. These indexing tricks come in handy to avoid "for" loops and in vectorizing code. A linear index allows use of a single subscript to index into an array, such as A(k). MATLAB ® treats the array as a single column vector with each column appended to the bottom of the previous column. Thus, linear indexing numbers the elements in the columns from top to bottom, left to right. For example, consider a 3-by-3 matrix. Indexing into a matrix is the way to access its elements, rows or columns: in MATLAB there are several different approaches of this operation. At the end of this post a demonstration with several examples is available. If you are not familiar with the colon (:) operator, please have a look at MATLAB documentation.

## Suppose I have an array, a = [2 5 4 7].What is the function returning the maximum value and its index? For example, in my case that function should return 7 as the maximum value and 4 as the index.

### I most commonly see user code with scalar structures, by which I mean a structure with fields that contain other MATLAB stuff. But, since this is MATLAB, structs can also be arrays themselves. I think about them as cell arrays with one 'extra' dimension of indices being names, the rest being the usual indexing.

Indexing into a matrix is the way to access its elements, rows or columns: in MATLAB there are several different approaches of this operation. At the end of this post a demonstration with several examples is available. If you are not familiar with the colon (:) operator, please have a look at MATLAB documentation. Indexing: vectors in MATLAB are not the same as in every other programming language because the indexing starts from one instead of zero, which means that the first value has the index one. Column Vector: to define a column vector, you can either separate every element with a semi-colon (;) , or you can define the vector and use the transpose function, as we will see in the following sections:

### I need to include for loop in MATLAB to start with 2:13. But I need to start with 2,3,4 and skip 5 and again 6,7,8 and skip 9 and 10,11,12 until 13.

A linear index allows use of a single subscript to index into an array, such as A(k). MATLAB ® treats the array as a single column vector with each column appended to the bottom of the previous column. Thus, linear indexing numbers the elements in the columns from top to bottom, left to right. For example, consider a 3-by-3 matrix.

## Indexing with a Single Index. Another method for accessing elements of an array is to use only a single index, regardless of the size or dimensions of the array. This method is known as linear indexing. While MATLAB displays arrays according to their defined sizes and shapes, they are actually stored in memory as a single column of elements.

Indexing into a matrix is the way to access its elements, rows or columns: in MATLAB there are several different approaches of this operation. At the end of this post a demonstration with several examples is available. If you are not familiar with the colon (:) operator, please have a look at MATLAB documentation. Indexing: vectors in MATLAB are not the same as in every other programming language because the indexing starts from one instead of zero, which means that the first value has the index one. Column Vector: to define a column vector, you can either separate every element with a semi-colon (;) , or you can define the vector and use the transpose function, as we will see in the following sections:

Every variable in MATLAB® is an array that can hold many numbers. When you want to access selected elements of an array, use indexing. For example, consider the 4-by-4 magic square A: I need to include for loop in MATLAB to start with 2:13. But I need to start with 2,3,4 and skip 5 and again 6,7,8 and skip 9 and 10,11,12 until 13. Suppose I have an array, a = [2 5 4 7].What is the function returning the maximum value and its index? For example, in my case that function should return 7 as the maximum value and 4 as the index. I most commonly see user code with scalar structures, by which I mean a structure with fields that contain other MATLAB stuff. But, since this is MATLAB, structs can also be arrays themselves. I think about them as cell arrays with one 'extra' dimension of indices being names, the rest being the usual indexing. MATLAB supports various numeric classes that include signed and unsigned integers and single-precision and double-precision floating-point numbers. By default, MATLAB stores all numeric values as double-precision floating point numbers. You can choose to store any number or array of numbers as integers or as single-precision numbers. However MATLAB has indexing of arrays beginning from 1 instead of 0, which is the norm in almost every programming languages I have encountered so far. The reason 0-based indexing made sense to me was like this: In every processor I have seen, the address index begins with 0x00000000 say in an 8-bit processor and If I want to save 5 numbers