What variable type to use??
i need to perform calculations on various numbers ranging from 0 to as big as possible.i also need to perform divide operations on these numbers and i need the result to be very accurate including decimal points.
example: (24 * 1000000) \ 35250
what type should i declare these numbers as??
i have tried BigDecimal but it always rounds the result to a whole number??
BigDecimal setScale throws an ArithmeticExpression exception if roundingMode==ROUND_UNNECESSARY and the specified scaling operation would require rounding.
since my calculations would give results with many numbers after decimal point would it require rounding??
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Hi All,
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You need to use three tables to obtain this informaiton:
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2. rszetlxref - Cross reference between global variables and query name
3. rszcomdir - Query Name
Here is a sample program to obtian this info:
REPORT ZLIST_OF_VAR_4_QUERY.
TABLES: RSZCOMPDIR.
SELECT-OPTIONS: S_QUERY FOR RSZCOMPDIR-COMPID NO INTERVALS.
TYPES: BEGIN OF ty_query,
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vnam type rszglobv-vnam,
end of ty_query.
data: t_query TYPE TABLE OF ty_query.
SELECT ACOMPID CVNAM
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FROM RSZCOMPDIR as a
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Name Null? Type
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USER_ID NOT NULL NUMBER
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I am learning about type defs and wanted to ping the community to get a feel for what expanse of things they are useful for. Any and all comments are welcome.
Cheers!
CLA, CLED, CTD,CPI, LabVIEW Champion
Platinum Alliance Partner
Senior Engineer
Using LV 2013, 2012
Don't forget Kudos for Good Answers, and Mark a solution if your problem is solved.I found this (from LV Help) enlightening as to the differences between typedefs and strict typedefs:
Type Definitions and Strict Type Definitions
Use type definitions and strict type definitions to link all the instances of a custom control or indicator to a saved custom control or indicator file. You can make changes to all instances of the custom control or indicator by editing only the saved custom control or indicator file, which is valuable if you use the same custom control or indicator in several VIs.
Type Definitions
Type definitions identify the correct data type for each instance of a custom control or indicator. When the data type of a type definition changes, all instances of the type definition automatically update. In other words, the data type of the instances of the type definition change in each VI where the type definition is used. However, because type definitions identify only the data type, only the values that are part of the data type update. For example, on numeric controls, the data range is not part of the data type. Therefore, type definitions for numeric controls do not define the data range for the instances of the type definitions. Also, because the item names in ring controls do not define the data type, changes to ring control item names in a type definition do not change the item names in instances of the type definition. However, if you change the item names in the type definition for an enumerated type control, the instances update because the item names are part of the data type. An instance of a type definition can have its own unique label, description, default value, size, color, or style of control or indicator, such as a knob instead of a slide.
If you change the data type in a type definition, LabVIEW converts the old default value in instances of the type definition to the new data type, if possible. LabVIEW cannot preserve the instance default value if the data type changes to an incompatible type, such as replacing a numeric control or indicator with a string control or indicator. When the data type of a type definition changes to a data type incompatible with the previous type definition, LabVIEW sets the default value of instances to the default value for the new data type. For example, if you change a type definition from a numeric to a string type, LabVIEW replaces any default values associated with the old numeric data type with empty strings.
Strict Type Definitions
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LabVIEW 8.0.1; WinDoze XP
aut viam inveniam aut faciam -
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I think this is clear
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What variable type for database
Hi to all..
I would like to ask advice on what is the best type of variable to store and manage data. I am basically trying to build a small database of customer, names, address, tel number etc. The data is read and then saved into a simple excel or csv file. All is run locally, no need to connect to the web etc..
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thanks for your helphey!!!
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sample:
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import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;
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private JScrollPane scroll = new JScrollPane();
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fireTableRowsInserted(0,data.length - 1);
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return data[row][col];
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return cols.length;
public int getRowCount(){
return data.length;
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hope this will help
v.v. -
In the example attached to this question is a simple VI application that cast, using type cast of LabVIEW, one value to different other type. My understanding of type cast, in C, C++ and to my best knowledge, was an implicit adaptation of a numerical value in a specific format to an other format. The value should remain the same. Unless the type in which the value is assigned is not enough large or adapted to contain such a number ex:
I8 = 500;
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But in my example all the assigned indicator are large enough.
I have the same problem in LabVIEW 5.1.1 and 6.1
If someone could only tell me what it is used for?
Best regards,
Nitrof
Attachments:
Type_cast.vi 26 KBThe type cast function is really helpful for typecasting "unusual" data to a more convienient data format. It can also be used to coerce data, like in your example, but coercion is usually not always a good thing because it can cause bad values.
There are lots of good examples of typecasting.
For example, I use the typecast function to change refnums to unsigned 32 integers (U32), just so I can pass the refnums between VI's easier.
Another VERY common typecast is if you want to display the ASCII value of a character. Run the string character "A" into a typecast, and set the output type as a Unsigned 8 bit number (U8), and you will see 0x41. Take a look at my example VI's to see what I mean.
David
Attachments:
Type_cast_Example5.vi 16 KB
Type_cast_Example6.vi 18 KB -
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