How to calculate random number between Inf and 10 ?

Suppose i have a matrix given below

A= [-Inf 52.17 54 55.82 Inf]

Now how to calculate a random number between A(1) & A(2) and the random number should be a value, not Inf

Can anyone please help me with this

Answer 1

[Ameer Hamza]

The most negative value representable in double datatype is given by -realmax. You can do something like this

A= [-Inf	52.17	54	55.82	Inf];
x  = rand();
y = x*(-realmax) + A(2);

[Raj Arora]

hi ameer,

can you please suggest me the solution in terms of array elements using any loop rather than using -flintmax because than again i have to use separate function for next time

actually i have to calculate random number between

A(1) & A(2)

A(2) & A(3)

A(3) & A(4)

A(4) & A(5)

in a single loop

[Ameer Hamza]

You can do something like this

A = [-Inf	52.17	54	55.82	Inf];
B = A(:);
B(isinf(B)) = sign(B(isinf(B))).*realmax;

C = rand(numel(B)-1,1).*(B(2:end)-B(1:end-1)) + B(1:end-1);

[Raj Arora]

what if i have to perform Latin hypercube sampling for the given Performance function

Can you please check this and suggest me better way for this problem

you can check the attached file for the HINTS of how to perform LHS

%%STEPS FOR LATIN HYPERCUBE SAMPLING {Performance function : G=X1*X2-1900}%%

clear;

clc;

%Dividing CDF of Lognormal distribution (38,3.8) into 4 equal intervals%

X1 = logninv(linspace(0,1,5),0.6,0.1)

%Dividing CDF of Normal distribtuion(54,2.7)into 4 equal parts

X2 = norminv(linspace(0,1,5),54,2.7)

for i=1:4

%Random value is selected for every interval for X1%

m = X1(i) + (X1(i+1)-X1(i)) .* rand(1,1)

%Random value is selected for every interval for X2%

n = X2(i) + (X2(i+1)-X2(i)) .* rand(1,1)

%Matrix is used to get all the values of m together%

P(i)=m

%Matrix is used to get all the values of n together%

Q(i)=n

end

for j=1:4

k=randi(j)

a=P(k)

b=Q(k)

fprintf(' \n random sample (x,y)= %d',a,b)

z=a*b-1900

g(j)=z

end