syms x

>> x^2 + 4*x + 4

ans =

x^2 + 4*x + 4

>> (x+2)^2

ans =

(x + 2)^2

>> y=

y=

Error: Expression or statement is incomplete or incorrect.

>> y= ans

y=

(x + 2)^2

>> expand(ans)

ans =
x^2 + 4*x + 4

>> xx=0:0.01:3;

>> y_0=subs(y,0)

y_0 =

>> y_n=double(y_0)

y_n =

>> y_0=subs(y,0)

y_0 =

>> y=(x+2)^2/(x+5)

y=

(x + 2)^2/(x + 5)
>> y_0=subs(y,0)

y_0 =

4/5

>> xx

xx =

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Column 301

3.0000
>> y_x=double(subs(y,xx));

>> plo(xx,y_x)

Undefined function 'plo' for input arguments of type 'double'.

Did you mean:

>> plot(xx,y_x)

>>

>> xx=0:0.01:4.99:

xx=0:0.01:4.99:

Error: Expression or statement is incomplete or incorrect.

>> xx=0:0.01:4.99;

>> y_x=doble(subs(y,xx));

Undefined function 'doble' for input arguments of type 'sym'.

Did you mean:

>>

>>

>>

>> y=(x+2)^2

y=

(x + 2)^2

>> y_d=diff(y)
y_d =

2*x + 4

>> y_d=diff(diff(y))

y_d =

>> help syms

syms Short-cut for constructing symbolic variables.

syms arg1 arg2 ...

is short-hand notation for creating symbolic variables

arg1 = sym('arg1');

arg2 = sym('arg2'); ...

or, if the argument has the form f(x1,x2,...), for

creating symbolic variables

x1 = sym('x1');

x2 = sym('x2');

...

f = symfun(sym('f(x1,x2,...)',{x1, x2, ...});

The outputs are created in the current workspace.

syms ... ASSUMPTION

additionally puts an assumption on the variables created.

syms ... clear

clears any assumptions on the variables created, including those

made with the ASSUME command.

Each input argument must begin with a letter and must contain only

alphanumeric characters.

By itself, syms lists the symbolic objects in the workspace.

Example 1:

syms x beta real

is equivalent to:

x = sym('x','real');

beta = sym('beta','real');

To clear the symbolic objects x and beta of 'real' or 'positive' status, type

syms x beta clear

Example 2:

syms x(t) a

is equivalent to:

a = sym('a');

t = sym('t');

x = symfun(sym('x(t)'), [t]);

See also sym, symfun.

doc syms

>> y_d=diff(y,x,3)

y_d =

>> y_d=doble(subs(diff(y,x,2),1))

Undefined function 'doble' for input arguments of type 'sym'.

Did you mean:

>> y_d=double(subs(diff(y,x,2),1))

y_d =

>> Y

Undefined function or variable 'Y'.

Did you mean:

>> y

y=
(x + 2)^2

>> y_I=int(y)

y_I =

(x + 2)^3/3

>> y_I=int(y,0,x)

y_I =

x*(x*(x/3 + 2) + 4)

>> y_I=expand(int(y,0,x))

y_I =

x^3/3 + 2*x^2 + 4*x

>> resolucion de un circuito

Undefined function 'resolucion' for input arguments of type 'char'.

>> resolucion de un circuito

Undefined function 'resolucion' for input arguments of type 'char'.

Undefined function 'resolucion' for input arguments of type 'char'.

>> resolucion de un circuito

Undefined function 'resolucion' for input arguments of type 'char'.

>> resolucion de un circuito

Undefined function 'resolucion' for input arguments of type 'char'.

>> resolucion de un circuito

Undefined function 'resolucion' for input arguments of type 'char'.

>> resolucion_de_un_circuito

I_R_t_1 =

(exp(-t)*(4*exp(t)*sin(2*pi*f*t) - 4*pi*f*(2*exp(t)*cos(2*pi*f*t) - 2)))/(4*pi^2*f^2 + 1)

Error using mupadmex

Error in MuPAD command: DOUBLE cannot convert the input expression into a double array.

If the input expression contains a symbolic variable, use the VPA function instead.

Error in sym/double (line 827)

Xstr = mupadmex('symobj::double', S.s, 0);

Error in resolucion_de_un_circuito (line 12)

>> resolucion_de_un_circuito

I_R_t_1 =

-(4*exp(-t)*(pi*(2*exp(t)*cos(2*pi*t) - 2) - exp(t)*sin(2*pi*t)))/(4*pi^2 + 1)

>> resolucion_de_un_circuito

I_R_t_1 =

-(4*exp(-t)*(pi*(2*exp(t)*cos(2*pi*t) - 2) - exp(t)*sin(2*pi*t)))/(4*pi^2 + 1)

>> resolucion_de_un_circuito

I_R_t_1 =

-(4*exp(-t)*(pi*(2*exp(t)*cos(2*pi*t) - 2) - exp(t)*sin(2*pi*t)))/(4*pi^2 + 1)

I_R_t_2 =

6*t*exp(-t)

I_R_t_3 =
(24*exp(-t)*sin(pi*t)^2)/pi

>> resolucion_de_un_circuito

I_R_t_1 =

-(4*exp(-t)*(pi*(2*exp(t)*cos(2*pi*t) - 2) - exp(t)*sin(2*pi*t)))/(4*pi^2 + 1)

I_R_t_2 =

6*t*exp(-t)

I_R_t_3 =

(24*exp(-t)*sin(pi*t)^2)/pi

Error using hold (line 71)

Unknown command option.

Error in resolucion_de_un_circuito (line 30)

hold of

>>