Recent content by Hash

A sort of recoprocity theorem is often used in antenna engeenering, under the name "equivalence theorem". It states that the fields (E,H) in a region 1 can be expressed just as the radiated field by the electric and magnetic equivalent currents (J,M) of the exteriors fields in region 2, on a...

You must plot the same sized variables, ie : size(X)=size(Y)=size(Z) so you must have z in 4x4 form. By example, maybe you can (it depends of your problem) just reshape your z : >> Z = reshape(z,4,4) Z = 30 20 20 30 20 10 10 20 20 10 10 20 30 20...

You can do this with the assume command : >assume(n, integer); >cos(n*Pi); result : (-1)^n

The inverse Fourier transform represents a signal as a sum (continuous or discrete) of frequency, each of one having an amplitude. The (direct) Fourier transform represents this repartition of frequency from the signal. It describes how a signal is distributed along frequency. The power...

I think there are many reasons : - first of all, you do not cite any other work that Einstein's work. No references, even a GR book. So, how can we think that your work is serious ? - your first introduction sentence is : "Einstein's General relativity is wrong" ! You can't say that ! Einstein...

Since 1/\tau^2 is an analytic function with a singularity in 0 (a pole of order 2), the contour your want to use is closed, then you can use the Cauchy's theorem on residues. \oint 1/\tau^2 \, d\tau = 2i\pi \cdot 0 where 0 is the residue of 1/\tau^2

Octave may be what you want http://www.gnu.org/software/octave/