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 Make a string by repeating specified characters/st		  New Topic  Reply to Topic
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AKazak

Russia
1228 Posts
Posted - 02/17/2021 :  11:39:02 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
OriginPro 2021b (64-bit) Beta 5 9.8.5.105
Windows 7 Pro x64 SP1

Greetings!

Does LT have a neat command to generate a string by repeating specified characters/stings?

For example, I want to repeat "=" character 13 times and save it to a string variable.

Thank you.

---
Andrey

YimingChen

1684 Posts
Posted - 02/17/2021 :  3:32:44 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
You can simply define such function with Python and call from LT. Open menu Connectivity->Open Default Python Functions... then put in the code below and save.

def repeat(str, n):
    '''s:si'''
    return str*n

Then you can try LT script:
py.repeat(=,13)$=;


James
Edited by - YimingChen on 02/17/2021 3:32:57 PM
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AKazak

Russia
1228 Posts
Posted - 02/17/2021 :  3:51:49 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
quote:
Originally posted by YimingChen

You can simply define such function with Python and call from LT. Open menu Connectivity->Open Default Python Functions... then put in the code below and save.

def repeat(str, n):
    '''s:si'''
    return str*n

Then you can try LT script:
py.repeat(=,13)$=;


James


Dear James,

Great solution!
What is 
'''s:si'''
?
Also, can I get the same with multiple character core, for example, "a,b,c"?

---
Andrey
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YimingChen

1684 Posts
Posted - 02/17/2021 :  5:02:56 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Docstring is used to specify the input/output variable type, check below:
https://www.originlab.com/doc/python/Calling-Python-Functions-from-Column-Formula-and-LabTalk

Yes, you can use string as the first argument.

James
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AKazak

Russia
1228 Posts
Posted - 02/18/2021 :  08:44:26 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
quote:
Originally posted by YimingChen

Docstring is used to specify the input/output variable type, check below:
https://www.originlab.com/doc/python/Calling-Python-Functions-from-Column-Formula-and-LabTalk

Yes, you can use string as the first argument.

James


Dear James,

Is this a strict requirement to specify input and output types?
I noticed that https://www.originlab.com/doc/python/Calling-Python-Functions-from-Column-Formula-and-LabTalk provides many examples with unspecified input and output types.

Besides, where do I find a complete list of docstring data type identifiers, for example, F, S, i, etc.?

Thank you.

---
Andrey
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YimingChen

1684 Posts
Posted - 02/18/2021 :  09:22:38 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
This is necessary for embedded Python in Origin especially when you use it to set column values. It needs to know whether it's a scalar function or a vector function. See the explanation in the page:
https://www.originlab.com/doc/python/Calling-Python-Functions-from-Column-Formula-and-LabTalk#Specifying_Input_and_Output_Types

If you select menu Connectivity->Open Examples.py..., you can see the full list of docstring.

James
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AKazak

Russia
1228 Posts
Posted - 02/18/2021 :  12:44:01 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
quote:
Originally posted by YimingChen

This is necessary for embedded Python in Origin especially when you use it to set column values. It needs to know whether it's a scalar function or a vector function. See the explanation in the page:
https://www.originlab.com/doc/python/Calling-Python-Functions-from-Column-Formula-and-LabTalk#Specifying_Input_and_Output_Types

If you select menu Connectivity->Open Examples.py..., you can see the full list of docstring.

James


Got it!
Thanks.

---
Andrey
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AKazak

Russia
1228 Posts
Posted - 07/04/2022 :  05:39:34 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
quote:
Originally posted by YimingChen

This is necessary for embedded Python in Origin especially when you use it to set column values. It needs to know whether it's a scalar function or a vector function. See the explanation in the page:
https://www.originlab.com/doc/python/Calling-Python-Functions-from-Column-Formula-and-LabTalk#Specifying_Input_and_Output_Types

If you select menu Connectivity->Open Examples.py..., you can see the full list of docstring.

James


The hyperlink above is broken.
Please update he hyperlink.

Thank you.


---
Andrey
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YimingChen

1684 Posts
Posted - 07/05/2022 :  09:10:06 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Use this link:
https://www.originlab.com/doc/en/python/tools/Set-Column-Values#Specifying_Input_and_Output_Types
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AKazak

Russia
1228 Posts
Posted - 07/05/2022 :  09:46:28 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
quote:
Originally posted by YimingChen

Use this link:
https://www.originlab.com/doc/en/python/tools/Set-Column-Values#Specifying_Input_and_Output_Types


Got it!
Thanks.

---
Andrey
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aplotnikov

Germany
170 Posts
Posted - 07/05/2022 :  11:31:29 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply 
#include <origin.h>

string repnchar(string strCh, int n) {
    char *src=strCh.GetBuffer(1);
	int val=(int) src[0];
	strCh.ReleaseBuffer();
	string strRes;
	char *buf=strRes.GetBuffer(n);
	memset(buf, val, n);
	strRes.ReleaseBuffer();
	return strRes;
}


An improved version:
#include <origin.h>
string repnchar(string strCh, int n) {	
	string strTmp(strCh.GetAt(0), n);
	return strTmp;
}


PS. A prophecy: after a while Origin users will be experienced enough with Python to find out that Origin is just an optional environment for Python. :)
Edited by - aplotnikov on 07/05/2022 5:38:14 PM
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AKazak

Russia
1228 Posts
Posted - 07/06/2022 :  01:06:55 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
quote:
Originally posted by aplotnikov

#include <origin.h>

string repnchar(string strCh, int n) {
    char *src=strCh.GetBuffer(1);
	int val=(int) src[0];
	strCh.ReleaseBuffer();
	string strRes;
	char *buf=strRes.GetBuffer(n);
	memset(buf, val, n);
	strRes.ReleaseBuffer();
	return strRes;
}


An improved version:
#include <origin.h>
string repnchar(string strCh, int n) {	
	string strTmp(strCh.GetAt(0), n);
	return strTmp;
}


PS. A prophecy: after a while Origin users will be experienced enough with Python to find out that Origin is just an optional environment for Python. :)


Great optimization :)

---
Andrey
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