MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

# how to do tedious mathematical calculation with matlab

Asked by Passband Modulation on 5 Oct 2012

it is really tedious, probably impossible, to do the following equation using a calculator. Please note that cosine and sine functions are in degrees

the result should b a scalar value if i am right?

Walter Roberson on 5 Oct 2012

I see you have changed the wording of your question a little, and given the note about degrees, but the equation itself isn't there yet ?

Passband Modulation on 5 Oct 2012

sry, i just reuploaded the image, could you now see the equation?

## Products

No products are associated with this question.

Answer by Walter Roberson on 5 Oct 2012
```k = 0:65119;
sum( cosd(3.6*k) .* sind(3.6*k) ).^2
```

## 1 Comment

Passband Modulation on 5 Oct 2012

cool, it really works. actually, i just manage to obtain the result using

``` function [S] = sum1(n)
S = 0; % Initialize sum to zero
k = 0; % Initialize index to zero
% loop for calculating summation
while k <= 65119
S = S + cos(3.6*k*pi/180)*sin(3.6*k*pi/180); % add to summation
k = k + 1; % increase the index
end```

and then square the outcome, and get the answer as urs.

cool, urs looks tidier. many thx