Always getting 0.00 when dividing x with X

[Ognen]

Hello,

Why the result is always 0.00 when trying to calculate x/X?

%fml

ForEveryTile:{

    float st;

    for(x = x_start; x < x_end; x++){
        st=x/X;
        printf("%f",st);
    }
    return true;

}

Thank you and a Happy New Year

[paul simoens]

Hi Ognen,

C language sees most int as 0. But if you put it in a calculation or combine it with another float, it will be read as a value.
So you can e.g. try
st =x /X +0.0;

This should work.

 

Regards,
Paul

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[paul simoens]

One more thing,
I looked over the fact that int don’t go below 0. Because x <X, the result will unavoidable got stuck at 0.

You can use this:
float fx, fX;

Put this in the running loop
fx =x
fX =X

…
st =fx /fX;

- - - - - - - - - - - - - - - - - - - - -

Hi Ognen,

C language sees most int as 0. But if you put it in a calculation or combine it with another float, it will be read as a value.
So you can e.g. try
st =x /X +0.0;

This should work.

 

Regards,


Paul

+32 ( 0) 473 62 39 17

 

Van: filter...@googlegroups.com [mailto:filter...@googlegroups.com] Namens Ognen
Verzonden: woensdag 5 januari 2022 17:22
Aan: FilterMeister Mailing List (FMML)
Onderwerp: [FMML2] Always getting 0.00 when dividing x with X

 

Hello,

--

[Ognen]

Hi Paul,

> st =x /X +0.0

> This should work.

Nope, this doesn't work either

> st =fx /fX

This works. Storing x and X in variables works but not the other way around, when making division alone.

I begin to ask myself is it related to FM semantics because x, y, X, Y are always integers?

When making division when stored in a variables, the floating is allowed, when processing a division with them alone, it cannot process it. Why?

[paul simoens]

Hi Ognen,

This has nothing to do with FM. Integers are integers due their lack of a fractional part. Because x is always smaller then X, the result will range between 0 and max 1. It act like as you would calculate floor( fx /fX). That would also remain 0.0.

Mixing int with floats needs some care. Try to figure out the range that a particular calculation will make. Therefore I proposed my filterbase, so you can monitor step by step each variable and its result.

Correction of my former mail: integers can go negative, but not for pixel values. I would mean they cut off behind the comma.

Paul

 

 

Van: filter...@googlegroups.com [mailto:filter...@googlegroups.com] Namens Ognen

Verzonden: woensdag 5 januari 2022 18:19
Aan: FilterMeister Mailing List (FMML)

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[Ognen]

>This has nothing to do with FM. Integers are integers due their lack of a fractional part .

I feel so stupid now that have not remembered to convert x or X into float with (float)x and (float)X. That way it works if divided directly into a user created float variable. All types must be the same is the rule of thumb

So:

float st = (float)x/(float)X;

That will do it.

Thanks for the reminder Paul,

Ognen