eval (Matlab function) Execute a string containing an instruction/expression

## Matlab/Scilab equivalent

Matlab | Scilab
    eval
    evstr
    execstr

## Particular cases

Expression:

  When eval has to execute an expression then Scilab equivalent for eval is evstr

Instruction:

  When eval has to execute an instruction with just one output value then Scilab equivalent for eval is evstr. If instruction has more than one output value then execstr has to be used as follows.

When eval is used with two inputs then an equivalent can be found in examples below.

## Examples

Matlab | Scilab
    eval('1+1')
    eval('x=1+1')
    eval('[d1,d2]=size(1)')
    [d1,d2]=eval('size(1)')
    eval('1+1','1+2')
    evstr("1+1")
    x = evstr("1+1")
    execstr("[d1,d2]=size(1)")
    execstr("[d1,d2]=size(1)")
    if execstr("1+1","errcatch") then execstr("1+2");end