50g

I am making a model of a frequency mixer on the HP48GII. I need to make a square wave as part of this.

The way I thought I would do it was to make a cosine wave and then use the SIGN function to give me a +1 when it's positive and a -1 when it's negative. I seem to get a line at +1 not the expected result.

The formula I have in Plot is 'C1(t)= SIGN(cos(2*(pi)*F1*t))'.

t is the independent variable.

Anyone know why it doesn't work?

Ed

First some FYI...

cos should be COS. Upper/lower case matters, including the variables (t)

You don't really need 'C1(t)='. You can just use the righthand side by itself.

Use X for the independent var instead of 't', unless you change it in the settings.

Now, I'm not sure what all your equation does (F1 ?) so I simplified and the following works:

%%HP: T(3)A(R)F(.);
'SIGN(COS(2*\pi*X))'

or

%%HP: T(3)A(R)F(.);
'C1(X)=SIGN(COS(2*\pi*X))'

~~~
ASCII shall receive, Hollerith and get it quicker

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On Mon, 6/30/14, willowvst@... [50g] <50g@yahoogroups.com> wrote:

 Subject: [50g] Making a square wave on the HP48GII
 To: 50g@yahoogroups.com
 Date: Monday, June 30, 2014, 5:25 AM
 
 
 
 
 
 
 
 
 
 
         
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 I am making a model of a frequency mixer on the HP48GII.
 I need to make a square wave as part of this.
 The way I thought I would do it was to make a cosine wave
 and then use the SIGN function to give me a +1 when it's
 positive and a -1 when it's negative. I seem to get a
 line at +1 not the expected result.
 The formula I have in Plot is 'C1(t)=
 SIGN(cos(2*(pi)*F1*t))'.
  
 t is the independent variable. 
  
 Anyone know why it doesn't work?
  
 Ed