How to display the correct output of the product of matrix correctly when i wanted to conver degrees to radians

hi all, below is my code and I am trying to display the result of a matrix mutiplication correctly. Does reshaping of matrix or contencation of string?

prompt = 'Enter the numbers for conversion? ';

x = input(prompt)

y = x*(pi./180); % formula to convert degrees to radians

fprintf("%d degree\n = %d radians\n", x ,y);

my output is as follows:

What are the number/numbers for conversion? [180 360]

180.000 degree

= 360.000 radians

3.142 degree

= 6.283 radians

>>

The correct display i wanted is 180 degrees = 3.142 , 360 degrees = 6.283 radians

Answer 1

[VBBV]

prompt = 'Enter the numbers for conversion? ';
x = input(prompt)
y = x*(pi./180); % formula to convert degrees to radians
fprintf("%d \t %d degree\n = %d \t %d radians\n", x ,y);

[VBBV]

Use additional format specifiers %d %d followed with \n

[VBBV]

prompt = 'Enter the numbers for conversion? ';
x = input(prompt)
y = x*(pi./180); % formula to convert degrees to radians
for i =1:numel(x)
fprintf("%d degree\n = %d  radians\n", x(i) ,y(i));
end

Alternately you can use for loop for displaying one output at a time as above

[VBBV]

Another approach is

%if true
 fprintf('%d degree is %d radians\n', [x; y])

[Sophine Teng]

Hi vbbv , thank you for your answer. the first approach doesnt work but the second approach works.

By the way, could you explain to me how the logic works?

i means the number of elements that entered the loop?

[Sophine Teng]

Hi ,

I tried the second approach but it didnt work for the 1st row 2nd column output and second row 2nd column output.

my output shows like this:

Enter the numbers for conversion? [90 180; 45 360]

x =

90 180

45 360

90.00 degree

= 1.57 radians

45.00 degree

= 0.79 radians

>>

how to allow the prog to accept any size of matrix?

[VBBV]

Remember that y is output vector in radians. You need to enter the as many input values as row vector.

[VBBV]

A row vector without any ; between them

[VBBV]

Notice that the problem doesn't persist when you use the for loop approach presented

[Sophine Teng]

oh yes. thank you very much..the for loop works.. why is this so?

Answer 2

[Steven Lord]

The fprintf function will iterate through the elements of the second input you pass to it when determining how to fill the formatting operators. Once all the elements of the second input has been used it will move to the third, fourth, etc.

fprintf('%d %d\n', 1:5, 6:10)

1 2
3 4
5 6
7 8
9 10

If you want it to alternate you can concatenate the second and later inputs into an array:

fprintf('%d %d\n', [1:5; 6:10])

1 6
2 7
3 8
4 9
5 10

[Sophine Teng]

Hi Steven, this methods works unless you know the number of elements to output beforehand?

Correct me, if i am wrong.. I am just a beginner at it.

[Steven Lord]

By the way you've created x and y you know they're the same size. In order to concatenate them like I did, you need them to be row vectors. You can make them rows using reshape.

M = magic(4)

M = 4×4

16 2 3 13 5 11 10 8 9 7 6 12 4 14 15 1

r = reshape(M, 1, []) % 1 row by MATLAB-you-figure-it-out columns

r = 1×16

16 5 9 4 2 11 7 14 3 10 6 15 13 8 12 1