Illustration of preallocating a vector, MATLAB in Engineering

Assignment Help:

Illustration of Preallocating a Vector:

Illustration of calling the function:

>> myveccumsum([5 9 4])

ans =

    5  14  18

At the first time in the loop, outvec will be [5]. Then in the second time, runsum will be 14 and outvec will store [5 14]. Lastly, runsum will be 18 and outvec will store [5 14 18].

Though this technique works, it is ineffective. The other method includes referring to each index in the output vector, and placing every partial sum into the next element in the output vector. Since each and every value of vec(i) is added to the running sum, this new sum is stored in the outvec(i).

1994_Illustration of Preallocating a Vector.png

Though initializing the output vector outvec to all zeros is not strictly essential, it greatly improves the efficiency of the function. Initializing this vector to all the zeros with similar size as the input argument preallocates that much memory for the outvec. Then, each element is changed in the loop to its right value. On the other hand, when building a vector up one element at a time, as in the earlier illustration, the MATLAB has to find a new memory each time the vector is extended.

The MATLAB has many other functions which work with vectors. 


Related Discussions:- Illustration of preallocating a vector

Displaying the cell arrays, Displaying the cell arrays: There are seve...

Displaying the cell arrays: There are several techniques of displaying the cell arrays. The celldisp function shows all elements of the cell array:   >> celldisp(cellro

Image processing, Image Processing: The Images are represented as grid...

Image Processing: The Images are represented as grids, or matrices, of picture elements (known as pixels). In MATLAB an image usually is represented as a matrix in which each

Plotting file data, Plotting File data: It is frequently essential to ...

Plotting File data: It is frequently essential to read data from a file and plot it. Generally, this entails knowing the format of the file. For illustration, let us suppose t

Algorithm for the function e, Algorithm for the function e: The algori...

Algorithm for the function e: The algorithm for the function eoption is as shown: Use the menu function to show the 4 choices. Error-check (an error would take place

Built-in colormaps - image processing, Built-in colormaps: The MATLAB ...

Built-in colormaps: The MATLAB has numerous built-in colormaps which are named; the reference page on colormap shows them. Calling the function colormap without passing any ar

Appending variables to the mat-file, Appending variables to the Mat-File: ...

Appending variables to the Mat-File: Appending to the file adds to what has been saved in a file, and is accomplished by using the -append option. For illustration, supposing

Str2num function - string, str2num function - String: The function str2...

str2num function - String: The function str2num does the opposite; it takes the string in which a number is stored and converts it to the type double: >> num = str2num('123.

Illustration of graphics properties, Illustration of Graphics properties: ...

Illustration of Graphics properties: A particular property can also be exhibited, for illustration, to view the line width:     >> get(hl,'LineWidth')     ans =

Illustration of image processing, Illustration of Image processing: Th...

Illustration of Image processing: This displays that there are 64 rows, or in another word, 64 colors, in this specific colormap. It also displays that the first five colors a

Program to examine exponential function, Write a program to examine exponen...

Write a program to examine exponential function: We will write a program to examine the value of e and the exponential function. It will be a menu-driven. The menu options wil

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd