Skip to main content

Program in matlab to add the digits of a number

Problem

Write a program in matlab to add the digits of the given number using functions. For example if the input is 523 then the program should give the output as 5 + 2 + 3 = 10

Solution

This program in very simple and easy to understand. To understand this program, you will have to know few concepts. First of all look at the program and if you don't understand, go to explanation section under the program section, and if you still don't understand the program then head on to the links given below and read the concept so that you will understand the program easily. The links are as follows:
1) Function in matlab
2) num2str function in matlab
3) length function in matlab
4) for loop in matlab
5) str2num function in matlab
6) string referencing in matlab
7) vectors in matlab

Program


function res = add_digits(n)
%this function will add all the digits of th given number.
%for example if the number is 523 then the output of the program will be
% 10 = 5 + 2 + 3

%First of all we will convert the number to a string 
%so that we can reference each digit in the number easily
strin = num2str(n);

%Now we will create a sum variable to store the sum of the digits
sum = 0;

%A for loop to iterate through the digits
for i = 1:length(strin)
    sum = sum + str2num(strin(i));
end

res = sum;



to download the above program in matlab file format,then click here: add_digits.m





Explanation



Here in the function first we have written the comment so that if for any future usage, if you type the help command with the corresponding function name then you should get to know what the program is. And in the program it has been clearly explained what the program is, and I think it is not necessary here again to discuss the same thing.

Here we have used the num2str function with the input number so that we can reference the digits in the numbers like the vectors in Matlab.

In the next statement we have initiated a sum variable so that as soon as we find out the digit in the for loop we will simply add the number to the sum and finally at the end of the loop we will get the result.

Now digging deep we will find the for loop, we can get to understand this example using the number 523 and going iteration by iteration.



First iteration





The value of the sum is 0 and the value of i is , now the sum value gets added to the number 5 (the string we will reference will again be converted back to number using the str2num function). Finally at the end of the first iteration we will get the values as follows:



sum = 5, i = 1



Second iteration



The same explanation goes here as for the first iteration. But we will just see the values :



sum = 5+2 = 7, i = 2



Third iteration



Values are as follows:



sum = 7+3 = 10, i = 3



By this iteration the digits in the number are over and the loop comes to halt. Finally to return the output we will by referencing the res variable to the sum variable which has the value of the sum.







The above program has been high lighted using hilite.me







i have tried to explain this post so that it will be easy to understand for everyone. If you have any doubt or problem in understanding or anything, please do contact me so that it will not only help you but will also help others. you can contact me here: contact me







Also comment your solution for a given input in the comment below.



Keywords: add digits, matlab function, number

















Labels:














































Popular posts from this blog





















Problem 60 Project Euler Solution with python




























 Prime pair sets   The primes 3, 7, 109, and 673, are quite remarkable. By taking any  two primes and concatenating them in any order the result will always be  prime. For example, taking 7 and 109, both 7109 and 1097 are prime. The  sum of these four primes, 792, represents the lowest sum for a set of  four primes with this property.   Find the lowest sum for a set of five primes for which any two primes concatenate to produce another prime.   This problem is j u st a brute force problem. If you have come here because you don't know the limit upto which you will h ave to gener ate the prime numbers t hen go ahe ad and t r y with 10,000 .  When I first start ed solving the problem I chose 1 million(beca use most of the problem s on project E uler  have this limit ), but it took very long for the computer to fin d the solution. After searching on the internet then I found many people choosing 10, 000 so I have changed my in put f rom 1 million to 10000 and the output was f ast.   He...

























Read more






























Add/Embed SVG to Blogger website




























In this post I will tell you my method(trick) of adding SVG images in a blogger website or blog.   Before starting , the first thin g I am assu m ing is that you  are aware of SVG if you  are here. If not please see S calable V ec tor G raphics    Recently when I tried to embed a SVG image for a post on pygal, I tried uploading the SVG file and blogger Image uploader came up with  an error, because of which I had to find some other way.     SVG File upload Error in Blogger    I started sea rc hing Google " Embed SVG in Blogger " . I found blogorrhea , w h ich gave some i nformatio n on add ing SVG  directly as a markup , which worked , but I faced another problem using this . Also th is guy  has used lot of Javascript  which was confusin g for me, being new to using SVG.     So I first t houg ht of learning  on h ow to embed SVG  in HTML and t his on e worked out. Actually we can embed SVG in HTML i n following ways:   Using  Object tag  Using Iframe tag  Using embed...

























Read more






























Making a quiz web app with python and flask




























Edit : When you are creating a web app with  h tml templates, then y ou will have to sa ve the html file in templates folder in the Current Wor ki ng Directory( CWD). If you save the file in the C W D directl y you will get a TemplateNotFound  error.  Thank you Udhay for pointing it out.      In this post we will create a quiz website  using python . I will be using the flask framework . After reading this tutorial you will learn form submission , flask templates , python code in flask templates , shuffling the questions and options with the random module  and few others.    Please note that this tutorial is not big as it seems to be. Some of the code has been rewritten to maintain consistency and also font size is somewhat big so that your eyes won't get stressed reading this tutorial. Also the content has not occupied the full width of the page.   In this tutorial I am assuming that you are having a very basic understanding of the flask framework . Please refer the documenta...

























Read more