Something is wrong with my output...

Question:

Create a script that calculates the sine, cosine, and tangent of a vector from 0 to2π with steps of π/16. The numbers should have three digits to the right of the decimal. Determine an appropriate field width. Use fprintf to display the output in tabular format with the following headers.

x sin(x) cos(x) tan(x)

My code:

X = [0:(pi/16):(2*pi)]
a = sin(X);
b = cos(X);
c = tan(X);

fprintf('%6s %6s %6s\n','sin','cos','tan');

fprintf('%.3f \t %.3f \t %.3f\n',a,b,c);

and my output:

     sin    cos    tan
  0.000    0.195    0.383
  0.556    0.707    0.831
  0.924    0.981    1.000
  0.981    0.924    0.831
  0.707    0.556    0.383
  0.195    0.000    -0.195
  -0.383    -0.556    -0.707
  -0.831    -0.924    -0.981
  -1.000    -0.981    -0.924
  -0.831    -0.707    -0.556
  -0.383    -0.195    -0.000
  1.000    0.981    0.924
  0.831    0.707    0.556
  0.383    0.195    0.000
  -0.195    -0.383    -0.556
  -0.707    -0.831    -0.924
  -0.981    -1.000    -0.981
  -0.924    -0.831    -0.707
  -0.556    -0.383    -0.195
  -0.000    0.195    0.383
  0.556    0.707    0.831
  0.924    0.981    1.000
  0.000    0.199    0.414
  0.668    1.000    1.497
  2.414    5.027    16331239353195370.000
  -5.027    -2.414    -1.497
  -1.000    -0.668    -0.414
  -0.199    -0.000    0.199
  0.414    0.668    1.000
  1.497    2.414    5.027
  5443746451065123.000    -5.027    -2.414
  -1.497    -1.000    -0.668
  -0.414    -0.199    -0.000

[Stephen23]

@Michael spillane: please do not post the same question multiple times (I closed the other ones).

What is your question? You showed some code but did not ask us anything.

[Michael spillane]

Yea it didnt appear on my activity feed so I posted it again.

The question was in the thread title.. regardless,

The question I have is that the 3rd to last sin value and the 9th to last tan value are extremely wrong, so i am trying to figure out why my output is as such, as I believe that I have coded it correctly so debugging is difficult to spot my own mistake

Answer 1

[Stephen23]

You forgot that MATLAB is column-major:

X = 0:pi/16:2*pi; % square brackets are NOT required.
a = sin(X);
b = cos(X);
c = tan(X);
fprintf('%8s%8s%23s\n','sin','cos','tan');
fprintf('%8.3f%8.3f%23.3f\n',[a;b;c]); % note ; not ,

[Michael spillane]

It is still outputting the super huge numbers for the 3rd to end of sin and 9th to end of tan. Maybe it is an issue with the software because I dont see why it would output that giant value

[per isakson]

Looks ok to me

>> tan(pi/2)
ans =
   1.6331e+16

[Michael spillane]

ah.. when i had the table improperly spaced it appeared as if the large # was in the sin column. Im assuming the tanpi/2 is near the asymptote where the graph goes off to another universe

[Stephen23]

@Michael spillane: that is why I increased the width of the tan column to 23.