Completing elements of a matrix

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Karanvir singh Sohal
评论： Jan 2021-3-5
I have a matrix a
from a I have generated a new matrix b which have 2 new elements for 1 element of a
a = [2;3]
[m,n]=size(a)
for i=1:m
b=[1.5*(a(i)) 2*(a(i))]
end
I want to generate a new matrix 'c' such that it includes all the sets
expected results as
c = [2 3;2 4;3 4.5;3 6]
  2 个评论
KSSV
KSSV 2021-3-1
What is C? How you got it?
Karanvir singh Sohal
Karanvir singh Sohal 2021-3-1
编辑：Karanvir singh Sohal 2021-3-1
I want to generate c matrix. For a(1,1) i have 2 values in b i.e. b=[1.5*2 2*2] Which gives b=[3 4] And similarly for a(2,1) I'll have b=[4.5 6]
I want new matrix c
C=[a(1) 1.5*a(1); a(1) 2*a(1); a(2) 1.5*a(2); a(2) 2*a(2)]

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采纳的回答

Karanvir singh Sohal
Well I got what i was trying to do :)
Thanks @Jan for your time and help
L=4
X_Range=[L*1000/16 L*1000/10];
Shut= [152.4; 228.6; 304.8; 381.0; 457.2; 533.4; 609.6; 685.8; 762.0; 838.2; 914.4; 990.6; 1066.8];
X = Shut(Shut>=X_Range(1,1) & Shut<= X_Range(1,2));
[m,n]=size(X);
index = 0;
for i=1:m
Y_Range =[1.5*X(i) 2*X(i)];
Y = Shut(Shut>=Y_Range(1,1) & Shut<= Y_Range(1,2));
[mY,nY]=size(Y);
for j=1:mY
index=index+1;
XD(index)=X(i);
YD(index)=Y(j);
end
end
D= [reshape(XD,[],1) [reshape(YD,[],1)]]
  3 个评论
显示 1更早的评论
Karanvir singh Sohal
Karanvir singh Sohal 2021-3-5
Thanks this is a really simple version.
can you please explain me this part:
XD(end + 1:end + mY) = X(i);
YD(end + 1:end + mY) = Y;
Jan
Jan 2021-3-5
These lines do the same as your loop:
for j=1:mY
index=index+1;
XD(index)=X(i);
YD(index)=Y(j);
end
but more efficiently.

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更多回答（1 个）

Jan
Jan 2021-3-1
a = [2; 3];
b = [1.5; 2];
c = kron(a, [ones(size(a,1), 1), b])
  5 个评论
显示 3更早的评论
Karanvir singh Sohal
Karanvir singh Sohal 2021-3-2
I used for loop to obtain the desired results
L=4
X_Range=[L*1000/16 L*1000/10];
Shut= [152.4; 228.6; 304.8; 381.0; 457.2; 533.4; 609.6; 685.8; 762.0; 838.2; 914.4; 990.6; 1066.8];
X = Shut(Shut>=X_Range(1,1) & Shut<= X_Range(1,2));
[m,n]=size(X);
Shut(:,1);
for i=1:m
Y_Range =[1.5*X(i) 2*X(i)];
Y = Shut(Shut>=Y_Range(1,1) & Shut<= Y_Range(1,2));
[mY,nY]=size(Y);
for j=1:mY
c(j,1)=X(i);
endfor
c(:,2)=Y
endfor
This gives me the correct matrix but, I want to combine each c matrix.
when loop runs for first time it gives me c matrix of 2x2 and on second run i have 3x2
I want to combine c matrixs to get 5x2 in above example
Jan
Jan 2021-3-2
I do not get an idea of what you want to achieve.

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