Field calculators (available in QGIS, ArcGIS Desktop, etc) can recalculate the values of a single field on all, or selected, records within a table using an expression.

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Python code help for ArcGIS Field Calculator tool (Model Builder)

Is there any python code that: 1st, sort a column (example name by alphabet) 2nd, grab the first cell of sorted column and assigned it to a variable like A=.. I need all of this to be done in field ...
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523 views

If/else statement in arcgis

I try to fill the fields with the condition if / else but it does not work. I do not know where is my mistake in the code. def TextValue ( !Classe! ): if !Classe! == "Steppe arbustive" or !Classe! ...
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How to add “0” to multiple parts of text value in Field Calculator with Python

I have values in a text column that are as follows: 000_100 100_200 ... 1000_1100 1100_1200 I want it to read: 0000_0100 0100_0200 ... 1000_1100 1100_1200 I want all values to have the ...
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595 views

Calculate Fields with Null Values using arcpy.da.UpdateCursor of ArcGIS for Desktop?

How do you calculate fields with null values? I have multiple fields that may have null values, that aren't being calculated in the third field. import arcpy with ...
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3k views

How to Convert a Number to Percentage in Field Calculator

Using ArcGIS 10.2 and Personal geodatabase,I have a field with values of Numbers like 0.461538 and Type of "Double" can you please let me know how I can Export them to new Field in Percentage Format ...
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4k views

How to search text string and select item in QGIS?

I have a table attribute with complete roads name. I have to search items by digiting a part of the road name and I need to colour all the items selected. eg: ROAD NAME: / road 01 / road 02 / road 11 ...
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8k views

Find and replace, field calculator

Can someone show me a very simple find and replace in field calculator for just one or two characters in a field based hyperlink?
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4k views

Concatenating fields using VBscript in ArcGIS Field Calculator?

I'm trying to get one column of text to move into another column that already has text. I DON'T want to replace it, I want the transferring text to be added to the already existing text in a shp file ...
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Capitalizing The First Letter Of Each Word In Attribute Field QGIS

I have tried capitalizing the first letter of each string in my field/column called "COMMUNITY" by referencing this post: Capitalizing The First Letter Of Each Word In Attribute Field Particularly: ...
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116 views

Split a string between 2 characters

I have the following string in Arcmap: "Node 1_1234.23,Node 2_567.88,Node 3_45.25" I want to return the numbers between the "_" and the "," into three columns e.g "1234.23" in column A ...
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Generate a string based on an integer range

After some initial research, I was unable to find a solution for the following issue. I'm sure there's an answer to this question already floating around here somewhere, but hopefully someone can give ...
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4answers
325 views

How to remove period, comma, symbols using field calculator?

I want to delete . , # in attribute table using field calculator (VB Script or Python). How can I remove these using this example address: N. First St., Unit #1 (I don't need city or state name) I ...
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Calculate field management not working within customized Python tool in ArcGIS

I am trying to make a custom made Python Script tool which I would like to use in Model builder. I am using the arcpy.Calulate_field_management function (simple reclass function as an example), but it ...
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970 views

Extract numbers from string field

I am trying to calculate field test2 with only the numeric values from a string field test. The entire script is like: def makestr(test) list=[] for s in test: if s.isdigit(): ...
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138 views

Using Python For a Field Calc

In AcrMap 10.2 I'm trying to add a field and run this script in Field Calc: !shape.isMultipart! to see if I have any multipart lines. I keep getting geoprocessing failures. I am clicking the ...
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257 views

Conditional Statement for attribute data

I'm trying to write a conditional statement that references another field within the same shapefile layer. I want it to only do so if the one field is " Null " and leave is alone if there is already a ...
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370 views

How to get a string from a Double with a fixed number of decimals?

I have a featureclass (in a File Geodatabase), with a particular field of type Double. I want to copy it over to a text field, so that only 3 decimal places are shown. For example: 34.78902345 ...
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Debugging ERROR 000539 from CalculateField in ArcPy?

I previously successfully used the sample code here: How to calculate Field using part of filename in ModelBuilder? # Import standard library modules import arcpy, os, sys from arcpy import env # ...
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228 views

How to select only areas bigger than x acres?

I would like to create a new shapefile from another area shapefile. The new shapefile should only contain all areas that are bigger than 5 acres (10.000 m²). How do I do this?
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Replacing Variable in VB-Expression-File (.cal) of ArcGIS Desktop?

I'm trying to modify a VB-Expression saved in a cal-file by ArcGIS Desktop 9.3: dim out if [D19830701]=-9999 then out= [D19830501] else out= [D19830701] end if ...
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82 views

Calculate field more wisely

I first classified firstCol into groups and then I want to give the groups with different weighted values in another field, SecondCol. I will need to give different weighted values very often. I find ...
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How to compute the distance from the current polygon centroid to another in QGIS field calculator?

There is layer with polygons. I want to save in new field distance of every polygon's centroid to centroid of one particular polygon. To do this I should write some expression like this: ...
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110 views

How to convert text to proper case using the field calculator?

I am working on a set of data that has over 40,000 records on ArcGIS and I want to use a Proper Case for several fields/columns on the table. Is there a Python or Java Script that can help me automate ...
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142 views

How to generate random points from FIDs using ArcPy or ArcGIS Field Calculator?

I'm trying to generate a shapefile of random points using FID from the attribute table. My attribute table has 800,000 features and I only need a sample of 240. Is there a way to do it in arcpy or in ...
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How do I add rows together to populate a new field?

How do I add the values in columns 11_acciden, 12_acciden, 13_acciden, and 14_acciden in order to populate the total_acci column?
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372 views

python expression convert field to string and format with leading zeroes

I would like to create an expression using the field calculator in ArcMap to be able to convert an Int field to a string and add leading zeroes. I am able to do it in a python window with an example ...
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143 views

Calculate Fields from 3 different fields using ArcGIS for Desktop?

I'm using a shapefile of different vegetation and land cover types and I want to generalize to a simpler classification (ie. I only need to differenciate between young and old forest and open land, ...
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113 views

Extracting data from Address field using ArcGIS for Desktop?

I am fairly new to using python in field calculator and could use some help. I want to populate SitusRdType with RD or AVE or LN or ST or DR depending on the road type. I also want to just have the ...
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195 views

Field Calcuator to add percent using Python

What might I go wrong here is that I am trying to add percent. I use the Field Calcualtor and it keeps getting an error. I am opening the Table to add a field named Percent and then type this: ...
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384 views

Simple field calculator equation in ArcGIS 10.2.1 not working with python parser

I am trying to calculate a percentage in a field in a table. customers and total_customers are short integer fields. arcpy.AddField_management(tableSepSel2, "percent", "DOUBLE") ...
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1k views

Concatenating text and string in Field Calculator expression (python)

I'm trying to copy an attribute value from one field to another (sum of raster values), but I'm having issues in writing a functioning expression for a Calculate Field script. I'm adding a field ...
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856 views

Using Python if/then/else to return value from either of two fields based on value of third using ArcGIS Field Calculator?

I'm trying to avoid manually inputting Begin and End engineering station values already inputted into a seperate field. I'm dealing with(4) fields: Begin_Sta End_Sta Beg_End and Station. The ...
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Automatically assign numbers to point file in various order in QGIS

I know how to automatically assign numbers to a new point files using the $rownum function in the field calculator. However it does it from the top-left over and down like reading a book. I could ...
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Virtual fields are lost when duplicate layers

I've just upgraded to QGIS 2.12.3 - and hoped that the issue which was really time-consuming in 2.12. <3 could have been solved ... On duplicating layer - with tons of joined tables and virtual ...
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“CountIf” or alternative function in ArcMap field calculator?

Within ArcMap 10.3 field calculator, I am looking to count the number of features in a column that match the current value, and output that count. Ideally, the output would look like this: Number ...
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1answer
46 views

Help with else/if else in arcMap? [closed]

I'm attempting to create quick code that simply assigns a gps coordinate to a certain station on the map. Here's my current code Pre-logic script code: def update_nones(lat,bay_statio): if ...
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How to select different values from two columns through Select By Attributes?

I'm using ArcMap 10.3. I'm trying to select by attributes different values from two columns. I want to define the areas where Main rock is GRAVEL And Sub-rocks are : a. mudstone tephra loess b- ...
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52 views

Debugging Indentation error on Python Parser of ArcGIS Field Calculator?

Would anyone please help me find out why I get an indentation error in line 3 def calc(f1,f2,f3): remove_list = ['01ST', '02ND', '03RD', '04TH', '05TH', '06TH', '07TH', '08TH', '09TH'] if f2 in ...
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QGIS upper round in field calculator

I need to to in the field calculator the following calc: toint(Field1 / 25.0) but i need to round the result to no decimal places but upwards. Exmaples: If 17/25 result should 1. If 25/25 result ...
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289 views

Calculate Field with Python Issues (If statements)

I don't know a whole lot about python and scripting, so I was hoping somebody could give me a couple pointers on fixing some code. I am trying to calculate a "final results" attribute field. The ...
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111 views

count how many times an attribute is repeated, using “field calculator”

I'm using Arcgis 10.2.2 there is a way to count how many times an attribute is repeated, using the "field calculator" to make a selection after example of repeating more than 20 times
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102 views

How to work with accentuated strings in Python scripts in ArcGIS Desktop Field Calculator?

` pre-logic: def myCalc(name,nameVal): if (name == nameVal): return 1 else: return 0 var_name= myCalc(!Epulettipus!,"Lakóépület") ` This doesn't work with accentuated strings. (But ...
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473 views

How to concatenate double with string in field calculator with Python expression?

I'd like to concatenate my lat/lng with a few string fields in ArcGIS. What is the correct expression to use, avoiding VBA. I don't want to convert the lat/lng fields to string either. my 4 fields ...
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1answer
79 views

Calculation of a text value, The value of which is separated by a special character

How can I calculate a text value, the value of which is separated by a special character? For example: dog | duck, I would like to keep the first value: dog or elephant | cat, I want to keep ...
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5answers
228 views

Calculations in if statement

I want to perform a simple calculation with the Field Calculator using this piece of script (note that all the elif statements are attempts for another syntax and non of the worked): def ...
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901 views

How to sum up multiple columns values into one single column

I have one table containing many columns. Using field calculator, I want to create a new column containing (for each line) the sum of all columns values. Pretty dumb, but just cannot find the correct ...
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359 views

Creating a new integer field based on text in a different field - ArcGIS 10.1

I need to create a new integer field based on another text field. All instances of a the same text string in the existing field should be assigned the same number (starting at number 1). Can I do this ...
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How to write a expression in field calculator for finding $X and $Y?

I'm trying to calculate the lat/long of points using the Q GIS field calculator.Nathan W suggested to First, save the layer as WGS84 and import it again. Then in the field calculator you can use $x or ...
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446 views

How to write a QGIS regex for rounding to two places after the decimal point?

In QGIS field-calculator round() is not working in QGIS 1.8 so I try to do the following with a regex: I'd like to keep the first two places after the decimal point - where do I go wrong? ...
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699 views

ArcPy Field Calculation with special characters

I'm trying to calculate a string field, using "µSv/h". Running this in the manual field calculator works just fine, but I've tried this in the Python window in ArcMap as well as the IDLE, but both ...