[Scilab-users] qustion on functional argument

[Tim Wescott]

This is mostly just stylistic nit-picking, but the best practice to use
for the least confusion across many languages is to put spaces between
operators and operands -- I feel that it makes the code more readable,
and in most languages that I've used it's perfectly acceptable.  In a
few languages it prevents subtle errors.

So,

b = 1 ./ x

On Mon, 2015-04-20 at 19:09 -0400, roger.cormier at ncf.ca wrote:
> Let me understand correctly. You have two conditions, namely when x>1, and when x<=1. For x1, you want an element-by-element 1/x, not a matrix inversion of x.
> 
> For element-by-element division, I would use:
> 
> b=1 ./x
> 
> Note the space between "1" and the period "." because "1" is a number not a variable. Look in the help section under "division". It will explain the "/" and how to manipulate it to get what you want to achieve.
> 
> Regards,
> 
> 
> 
> 
> ___________________________
> Dr. Roger Cormier, P.Eng.
> Home Tel. & Fax: 613-823-7299
> 
> 
> Le dim. 19 avr. 2015 à 11:57, fujimoto2005 a écrit :
> 
> > I define a function with a scalar argument and use it with a matrix argument.
> > I want to get the matrix whose entry is the functional value for each entry
> > of a matrix argument.
> > When the function contains no "if then" close, I get the desired result as
> > the following function "f".
> > However when the function contains "if then "close, the function returns the
> > inverse matrix as the following function "g".
> > It is because "x>1" is false as a matrix and “else part” is executed as
> > inverse matrix calculation.
> > I want to get the code that "if then" is applied for each entry of matrix.
> > Please teach how to get such a code.
> > 
> > **code****
> > function a=f(x)
> >    a=x+1
> > endfunction
> > X=[1,2;3,4]
> > f(X)
> > 
> > function b=g(x)    if x>1 then
> >        b=x+1
> >    else
> >        b=1/x
> >    end
> > endfunction
> > X=[1,2;0.1,-0.1]
> > g(X)//returns inverse(X)
> > 
> > 
> > 
> > 
> > --
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-- 

Tim Wescott
www.wescottdesign.com
Control & Communications systems, circuit & software design.
Phone: 503.631.7815
Cell:  503.349.8432