Matlab array multiplication between numeric and variable array

Question

Mohamed Musni 2018-1-23

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/378532-matlab-array-multiplication-between-numeric-and-variable-array

评论： Mohamed Musni 2018-1-23

 qi=sym('qi',[1 3]); %define variables q1, q2, q3
prompt = 'enter which point in time you want to find inventory level'; %%user input for time range. ex: 0:6
j = input(prompt)
prompt = 'enter how many basic delivery cycles inventory of item should delivered to retailer i'; %user input for delivery cycles of three retailers ex: [1 2 3]
fri = input(prompt)
p = j
L = bsxfun(@rdivide,j(:),fri)     %%find xij matrix which retailer orders at which point. in Xij matrix, 1 means retailer place order and 0 means there is no order from retailer.
R = mod(L,1)
Xij = R <= 0 % print Xij matrix with 1 and 0. three columns for three retailers
B = Xij.*qi % multiplication of Xij with [q1 q2 q3], and i got error message for this matrix as below
if true
 >> optimize_vendor
Dr =
[ 1, 2, 3]
M =
6
enter which point in time you want to find inventory level [0:6]
j =
   0     1     2     3     4     5     6
enter how many basic delivery cycles inventory of item should delivered to retailer i [1 2 3]
fri =
   1     2     3
p =
   0     1     2     3     4     5     6
L =
       0         0         0
  1.0000    0.5000    0.3333
  2.0000    1.0000    0.6667
  3.0000    1.5000    1.0000
  4.0000    2.0000    1.3333
  5.0000    2.5000    1.6667
  6.0000    3.0000    2.0000
R =
       0         0         0
       0    0.5000    0.3333
       0         0    0.6667
       0    0.5000         0
       0         0    0.3333
       0    0.5000    0.6667
       0         0         0
Xij =
7×3 logical array
   1   1   1
   1   0   0
   1   1   0
   1   0   1
   1   1   0
   1   0   0
   1   1   1
Error using symengine
Array sizes must match.
Error in sym/privBinaryOp (line 973)
          Csym = mupadmex(op,args{1}.s, args{2}.s, varargin{:});
Error in  .*  (line 294)
      X = privBinaryOp(A, B, 'symobj::zip', '_mult');
Error in optimize_vendor (line 24)
B = Xij.*qi
end

Till Xij matrix my code is working perfectly. i need help to multiply Xij array with [q1 q2 q3] array which means first column of Xij with q1, second column with q2 and third column with q3. and finally i need to get sum of each row by variables. ex: q1+q2+q3

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Mohamed Musni 2018-1-23

编辑：Mohamed Musni 2018-1-23

that is my problem. i want to define qi in a array such as [q1 q2 q3] and multiply with Xij. i try to define like this qi=sym('qi',[1 3]); and it wont create the array