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parse error near line 2 of file Running

  syntax error

>>> abcd =2x+4(35+x)

           ^

parse error near line 2 of file Running

  syntax error

>>> 2x+4(35+x)=94

     ^

parse error near line 1 of file Running

  syntax error

>>> solve(2x+4(35+x)=94)

           ^

error: bode: require at least one LTI model
error: called from
    __frequency_response__ at line 65 column 5
    bode at line 66 column 16
    Running at line 11 column 9

error: bode: require at least one LTI model
error: called from
    __frequency_response__ at line 65 column 5
    bode at line 66 column 16
    Running at line 4 column 1

error: bode: require at least one LTI model
error: called from
    __frequency_response__ at line 65 column 5
    bode at line 66 column 16
    Running at line 4 column 1

error: invalid use of script c:\work\pianolj@gmail.com\mathfreeon\workspace\abs.m in index expression
error: called from
    abs at line 1 column 1

error: invalid character '�' (ASCII 226) near line 45, column 9
parse error near line 45 of file Running

  syntax error

>>> legend(‘euler’, ‘rk2’, ‘rk4’)

           ^

error: invalid character '�' (ASCII 226) near line 45, column 9
parse error near line 45 of file Running

  syntax error

>>> legend(‘euler’, ‘rk2’, ‘rk4’)

           ^

error: invalid character '�' (ASCII 226) near line 45, column 9
parse error near line 45 of file Running

  syntax error

>>> legend(‘Euler’, ‘Runge_kutta 2’, ‘Runge_kutta 4’)

           ^

error: invalid character '�' (ASCII 226) near line 45, column 9
parse error near line 45 of file Running

  syntax error

>>> legend(‘Euler’, ‘Runge-kutta 2’, ‘Runge-kutta 4’)

           ^