The following error occurred converting from sym to double: DOUBLE cannot convert the input expression into a double array.

syms a b c d e f g h 

I am trying to write a code for linprog, so i defined this constant variables

% Lower bounds
lb =(zeros(6,1));
lb(1,2,5,6) = [e,g,a,c];

Then I got the following error from matlab:

The following error occurred converting from sym to double:
DOUBLE cannot convert the input expression into a double array.

please help.

Answer 1

[Star Strider]

To define a vector of subscripts to ‘lb’, use square brackets, just as you woukld with any other array:

syms a b c d e f g h 
lb([1,2,5,6]) = [e,g,a,c];

producing:

lb =
[ e, g, 0, 0, a, c]

[sanjay chaudhari]

thank you.

[Star Strider]

My pleasure.

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