MATLAB: Please anyone help me with the error!

convertMATLABsymbolicSymbolic Math Toolbox

Please write the code- Screenshot (14).png

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fprintf('The potential difference is \n')
disp(potential)

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MATLAB: Dealing with lengthy expressions

If they are symbolic expressions, it might make sense to use matlabFunction() to convert them from symbolic code to MATLAB; you would use the option to write to a file. You might also want to experiment with the optimization option.

Alternately,

fid = fopen('NewFile.m', 'wt');
fwrite(fid, char(TheSymbolicExpression));
fprintf(fid, '\n');
fclose(fid);

This will not, however, automatically wrap the expression.

Here is a way that might help:

newstr = regexprep( char(TheSymbolicExpression), '([+*/-])', ' $1 ');

(Note: it is required that the - character be the last thing in the [] if the dash is there at all.)

The newstr that is created will have whitespace where the original would have strung everything together. That whitespace may help if you have an editor with an auto-format function.

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

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]

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MATLAB: Dealing with lengthy expressions

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

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