Field calculators (which are available in QGIS, ArcGIS-related products, etc.) can recalculate the values of a single field, on all, or selected records within a table based on a symbolic expression.

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Bug in Qgis 2.0 Field Calculator with Values from Joined table

I have a data of hospitals. I have two excel sheets, one has no of patients examined in each hospital and other has no. of patients treated in each hospital. I want to find percentage of treated ...
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59 views

Populate a new field with list of the top 5 values of all fields for that record

I have 15 fields. I would like to add a new field that is populated with the field name and value of the top 5 highest values of the 15 fields for each record in the table. The new field would be a ...
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14 views

Unique referencing based on Co-ordinates

I have a list of 400 nodes, all split across 'maps' which are gridlines 1000x1000m. Each grid area is referenced by the first 3 digits of the X value of the centre and first 3 digits of the Y value ...
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156 views

Select Expression and Field Calculator in ONE STEP with QGIS

I have an Open Street Map Shapefile and i want to use Field Calculator to add information to a field called a800900 according to the field TYPE of street, by different area (field called ID_2). The ...
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88 views

Doubt in Field Calculator

I am working in an project.I have a point Shapefile its projection is NAD83(HARN)Pennslyvaniasouth(ftUS)*EPSG3365* when I measure its distance(between two points) it gives me the answer in feet .yes ...
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48 views

Ádvance Python Field Calculator - Global Expressions [duplicate]

I am trying to create a global expression that populates a new field based upon existing values in an attribute table. I am using QGIS Dufour and the Sextante toolbox, and the "Advanced Python Field ...
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51 views

Problem with field calculator

New to QGIS and suspect I'm missing something basic but.... When I input the formula to create a new field, all the calculations are correct but when I press the "Save Edits" button, all the figures ...
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168 views

Using Field Calculator to Calculate a Mean for Multiple Rows

I am trying to calculate a mean across a multiple number of attribute rows and have this value added to a new field that I have entered in the attribute table. I have an attribute table which has a ...
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75 views

Import csv file and use “toggle editing” and “field calculator” without Saving it as a Shapefile.

I am importing a .csv file in QGIS and I have also made the *.csvt file where I have specified my data types. I still cannot use "Toggle editing" and "field calculator".Whether I must save it as a ...
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78 views

Automatic update of field calculator. [duplicate]

When I calculate length or ID it is only for the existing data but not doing it for new entry. How can I make the fields calculate current/data?
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61 views

using Field PyCulator to input data in PostGIS layer

I'm triyng to input data in a prymary key field of a PostGIS layer, using the GID, a string field for codification (), and a text ("NH"). But I don't know how to make it works under Python! (Q GIS ...
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43 views

( how to use Field Calculator to count number of duplicated recordes at another field? [duplicate]

How To Use the Field Calculator python script to count the number of duplicated records of a field "A" and get the count at another field "B"
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182 views

python script to calculate and return values based on several conditions

I need to calculate and return the value "continuous" to those records in a polygon feature class with species records aggregated to a UTM grid considering the attributes are species name, grid code, ...
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29 views

Exporting QGIS attribute table to excel [duplicate]

I have a million rows in the attribute table, with lat/lon columns that I want to export to Excel. Selecting all the rows causes QGIS to crash. Is there another way to do the export? The million rows ...
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55 views

Replace Null Values Field Calculator [duplicate]

I am using ArcGIS 10 and have a polygon shapefile in which many of the numeric fields are Null. The polygon shapefile in question is produced by joining a polygon shapefile with a point shapefile and ...
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26 views

I need to add one table to another table as strings.

But all of this two table data is numeric. And one of them is float. So I need to add from the float table only integer and merge it with other table. What to write in field calculator?
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288 views

How can I get shape filename in attribute field using field calculator with VBA?

I want to store ths shapefile name in an attribute field using the field calculator and visual, but can't find the way to do it. Can anyone help me, please? Thanks!!!
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63 views

How to populate polygon extents to an attribute table in QGIS

Is there a way to calculate the XMIN, YMIN, XMAX and YMAX of a polygon and write it to a field in an attribute table? The Geometry functions available in the Field Calculator are for points. ...
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339 views

Python Field Calculation [duplicate]

Possible Duplicate: Iterative position within Field Calculator/Python I need to calculate a field for a data set that is grouped by county. At each change in county I need the column to ...
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101 views

IF-Statement in Field Calculator [closed]

I want to use an IF/ELSE-Statement to define a field in the attribute table of my raster. Therefore I have a field "VALUE". The condition should be: If "VALUE" < 4 ...then use die field "A".....if ...
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1answer
118 views

Error python calculation in field calculator

In a shapefile, I have Field named Elevation with a text field containing integer ranges stored as strings: 1 - 2 3 - 6 2 - 3 8.5 - 12 11 - 12 I need to categorize it using rule that if Elevation ...
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1answer
50 views

Why does dividing two decimal field values using Field Calculator return/write Integer? [duplicate]

I have fields in my datasets such as HR60, HR70, HR80, HR90 When I tried to use field calculator using the following [HR70]/[HR60], all I got was 1, 2, 3, 4 as my values. Last time I checked ...
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220 views

Field Calculator Does not Work in Arc10

I'm having a problem, described below, with Field Calculator in ArcGIS 10. I wonder if there is a known fix at this point. I'm updating to 10.1 soon, but this work cannot wait until then. Details: ...