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shafei

USA
49 Posts
Posted - 02/07/2012 :  1:51:51 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin):8.1
Operating System:7

Hi,
I was wondering if Origin C has a command like "setprecision" in C++.
In my code in Origin C, I generate some random numbers. Instead of having a number of the form 12.3454937 I would like to generate one like 12.34. Is there a command for that?
Thanks

Penn

China
644 Posts
Posted - 02/07/2012 :  9:33:00 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Please try the prec function.

Penn
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shafei

USA
49 Posts
Posted - 02/07/2012 :  9:39:49 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Works great! Thank you very much.
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shafei

USA
49 Posts
Posted - 02/13/2012 :  2:51:46 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
I tried the code to generate some numbers with the command
x = prec(rnd() * 10, 4); and that's what I get:
7.94406
0.80123
6.32973
,etc.
What is wrong?!
I have Origin 8.1
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Penn

China
644 Posts
Posted - 02/13/2012 :  9:40:13 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

I have tried the command you mentioned in Origin 8.1, however, I am afraid that I cannot reproduce the problem. If possible, you can try in other computer to see whether the problem can be reproduced.

Penn
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shafei

USA
49 Posts
Posted - 02/14/2012 :  02:24:50 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Penn,
I generate array of x[i]s and y[i]s randomly and use them for some other calculations. I get numbers like 3.459057 while I like one like 3.46. The "prec" command works great when I just use it and printf numbers. However, when I transfer this numbers into a worksheet, using the same code I have written, the raw numbers like 3.459057 appears there.
So let me explain the process in details:
1. I randomly generate x[i] and y[i] where I use prec command and also I have xaux[i]=x[i] and yaux[i]=y[i].
2. I do use them some calculations and some of them are stored as xmax[i] and ymax[i]. Then these values are printed out in a worksheet. Here, instead of seeing desired numbers, i.e. 3 significant digit, the numbers have 5 or 6 significant digits.
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Penn

China
644 Posts
Posted - 02/14/2012 :  03:16:23 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

The problem may be the calculations you have performed on the data. The data you used for calculations is with four significant digits, however, the results will not also be with four significant digits. If you want to have 4 significant digits for the results, you can use the prec function to make the results with four significant digits. In your case, maybe you can do like this:

xmax[i] = prec(xmax[i]);
ymax[i] = prec(ymax[i]);


Penn
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atashawn

1 Posts
Posted - 03/08/2012 :  07:48:21 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
This is quite interesting. I'd make a further research about this matter. Thank you for this input.
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