Subject:
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Re: Converting a float to an integer
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Mon, 13 May 2002 01:39:24 GMT
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Viewed:
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2453 times
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It looks like xdist and ydist are integers. You divide an integer by an
integer, the answer is an integer.
For example, if xdist=5 and ydist=10, you have 5/10, the answer is 0 (with a
remainder of 5). So, if you do the multiply first, you will be dividing a
bigger number (let's say MAX_SPEED is also 10), so 10*5 is 50, then 50/5 is
5. Half of max speed, which is what you would expect.
In lugnet.robotics.rcx.legos, Michael Marklew writes:
> I have built a plotter and want to draw a diagonal line of varying angles.
> It requires one motor to run slower then the other at a ratio based on the
> distance it has to travel compared to the other one.
>
> So I do something like this
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> xspeed = (int) MAX_SPEED*(xdist/ydist);
> motor_c_speed(xspeed);
> lcd_int(xspeed); lcd_refresh();
>
> The LCD always displays a "0" and of course the motor stops. I have
> outputted each variable separately and the result is not 0. So I figure it
> is a float to an integer problem.
>
> Turns out the problem was the brackets around xdist/ydist... Take them out
> and it works fine..
> xspeed = (int) MAX_SPEED*xdist/ydist;
>
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Message is in Reply To:
 | | RE: Converting a float to an integer
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| I have built a plotter and want to draw a diagonal line of varying angles. It requires one motor to run slower then the other at a ratio based on the distance it has to travel compared to the other one. So I do something like this xspeed = (int) (...) (22 years ago, 9-May-02, to lugnet.robotics.rcx.legos)
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