How do I add words onto strings? (Original string is blank but words are added if certain numbers from 1-20 are divisible by 2, 3, 5, or neither. At the end, each number is supposed to have a name)

Original string is blank but words are added if certain numbers from 1-20 are divisible by 2, 3, 5, or neither. At the end, each number is supposed to have a name)

Here is the original question:

Write a cell that displays the “name” of each number from 1 to 20 according to the rules below:

• If the number is divisible by 2, the syllable is “na”

• If the number is divisible by 3, the syllable is “ba”

• If the number is divisible by 5, the syllable is “mo”

• If the number is not divisible by 2, 3, or 5, the number is called “gano”.

These rules should be checked in order and numbers can have more than one syllable. You can use the command mod to check divisibility. If mod(x,y)is 0, then x is divisible by y. For our problem, as an example, the number 10 would be “namo”. The name must be on a single output line. Hint: You will need to use a for loop to iterate through the numbers 1 to 20. Then you will use if statements to test for each syllable.

I am also supposed to put && in between each condition but I do not know how to do this. Everything that I've read has not been overly helpful. Please help!

[David Hill]

You need to give it a try. Show us what you have done. If you have any specific questions, then ask. Your question tells you what to do. Look at matlab commands, for, mod, if. Matlab provides lots of examples that should help you.

[Kyle Donk]

This is what I have so far:

for x=1:1:20;
A=mod(x,2)
B=mod(x,3)
C=mod(x,5)
    
   name=[];
   if mod(x,2)==0
      name=[name,na];
      A=mod(x,2)
      
      A && B
      
   end
    
   if mod(x,3)==0
       name=[name,ba]; 
   end
   B && C
   if mod(x,5)==0
       name=[name,mo];
   end
   
   if mod(x,2)~=0,mod(x,3)~=0,mod(x,5)~=0,
       name=[name,'gamo'];
   end
   
end

I replaced the strings with brackets because I saw a video where that worked out, but so far, I'm not having any luck.

[Walter Roberson]

   name=string([]);
   if mod(x,2)==0
      name=[name,"na"];
      A=mod(x,2)
      
      A && B
   end

[Stephen23]

"Hint: ...Then you will use if statements to test for each syllable."

Huh. Or you can use MATLAB arrays and anonymous functions:

>> C = {'na','ba','mo','gano'};
>> G = @(x)[x,~any(x)];
>> F = @(n)[C{G(mod(n,[2,3,5])==0)}];
>> F(10)
ans =
namo

Answer 1

[David Hill]

name=cell(1,20);
for x=1:20  
   if mod(x,2)==0
      name{x}='na'; 
   end
   if mod(x,3)==0
       name{x}=[name{x},'ba']; 
   end
   if mod(x,5)==0
       name{x}=[name{x},'mo'];
   end
   if mod(x,2)~=0&&mod(x,3)~=0&&mod(x,5)~=0
       name{x}='gamo';
   end  
end
display(name);

[Kyle Donk]

I tried this but Matlab said this:

Unable to perform assignment because the left and right sides have a different number of elements.

Error in Matlab_Project_1 (line 79)

name(x)=[name(x),'gamo'];

[Stephen23]

@Kyle Donk: you changed the curly braces (used in this answer) to parentheses:

https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-cell-array.html

[Kyle Donk]

Whoops! I changed them to curly brackets but I still got an error in Matlab.

[Kyle Donk]

My bad, I mispoke. I ran the code with curly braces and Matlab said that curly braces were not supported in this type of problem. I also ran the code with parentheses and it said that "gamo" was not defined.

[Stephen23]

"I also ran the code with parentheses and it said that "gamo" was not defined. "

Apparently you also removed the leading single quote.

I just tried David Hill's answer and it worked without error.