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how to hide data in host image using secret key

hi I have this function in matlab
function [IRN,number ] = randnumbers( IRN )

IRN=int32(IRN);

ITOTAL=(IRN*330)+100;
ITOTAL=int32(ITOTAL);

IQUOTIENT=ITOTAL/2303;
IQUOTIENT=int32(IQUOTIENT);

IRN=ITOTAL-(IQUOTIENT*2303);

IRN=int32(IRN);
number=((IRN)./(2303));%%real number 0.2657

and for IRN=183 when I called the function the result tha I takes for number is 0 but it should be 0.2657.The way I called is [IRN,number]=randnumbers(IRN)

for a1=1:W
for a2=a1:W
for a3=a2:W
for a4=a3:W
for a5=i-a4-a3-a2-a1;
if(a4 <= a5 && a5<=W)
p2=[p2;a1,a2,a3,a4,a5];
end
end
end
end
end
end
Here if a1=1 then a2=1,2,3, if a1=2 then a2=2,3 and if a1=3 then a2=3. The same condition is for a3 & a4. Now I want to make this program only depends on "W" and "i" and I don't want to write a1,a2,a3,a4,a5.Because i need to run this code for i=4 and for a=2:4(a1 a2,a1 a2 a3,a1 a2 a3 a4)and again for i=5 and for a=2:4(a1 a2,a1 a2 a3,a1 a2 a3 a4,a1,a2,a3,a,a5).So i will be continue upto 17. and there are lot of values of "a".I just want to write "W,and i" and it will automatically generate value of "p2"

I am working on building extraction from multispectral high resolution satellite images.
Till now i am able to extract the boundaries of buildings, but the boundaries are not straight. i want the zig-zag boundaries to be rectangles. the image containing boundaries of buildings is a raster image. I want to convert the raster image into vector image.

I have a output as uploaded image1( http://testybab.blogspot.com/2013/06/fft-peoblem.html ). actually, i should take a Fast Fourier Transform of this output but i got exactly twice of desired amplitude and for phase, i got image2 (<http://testybab.blogspot.com/2013/06/fft-peoblem.html>) that obviously wrong.

Please help me

Function Name: switchCase
% Inputs (2): - (char) a string containg a word or phrase
% - (char) a string determining how to modify the previous
% input
% Outputs (1): - (char) the modified string
There can be 4 different ways of modifying the string:
- 'Title Case' -> Capitalizes the first letter of every word. Everything else is lowercase.
- 'Camel Case' -> Capitalizes the first letter of every wordEXCEPT the first one. Everything else is lowercase. All the spaces are removed.
- 'Da Vinci' -> Reverses the string.
- '1337' -> Changes each of the following letters(regardless of capatilization into #
L=1,Z=2,E=3,A=4,S=5,G=6,T=7,B=8,J=9,O=0

A ball of mass m1 and velocity v moves in the direction of +x and makes a central elastic collision with another ball, which is initially at rest and has mass m2, as shown in Figure.Write MATLAB GUI, to perform a simulation and animation of the system for the given m1, m2, and v.(we made a simulation in matlab.but the program did not work properly )

If 2% of the bolts produced by a machine are defective, write a Matlab m-file to determine and output the probability that out of 400 bolts chosen at random greater than 10 bolts will be defective. Compare your results with the analytical solution. Use a billon random events.

help us pls