SUMMATION USING ARC MAP(RASTER CALCULATOR)

[deepa_davis]

WHILE CALCULATION  AN EXPRESSION HOW TO PERFORM SUMMATION WHICH IS NOT FOUND IN RASTER CALCULATOR.

[DanPatterson_Retired]

Move to the Spatial Analyst Place in order to get an answer.

Summation is accomplished using the Plus tool in ArcToolbox, spatial Analyst Tools

[deepa_davis]

Sir i mean calculation from (i=0 to m a/b)

[DarrenWiens2]

Summation (I assume you mean adding pixel locations between rasters) in the Raster Calculator is achieved through the plus sign.

[deepa_davis]

I mean summation of values from i=0 to i=24 (not simple addition).summation(sigma) is not found in rater calculator.

[DanPatterson_Retired]

Their is no sigma...you either select and add the grids one at a time using the raster calculator or the Plus tool within a loop in a script that you will have to write.

[deepa_davis]

it is an equation to find sediment delivery ratio ,where equation is exponential summation of length of i th cell divided by slope of the i th cell

[DanPatterson_Retired]

Okay...You seem to be having an issue with my translation....so here are my comments and interpretations of what you need to do...

1. there is no automagic summation for everything button... if the tool doesn't exist, then you have to emulate it
2. you need to do the summation of part of an equation
3. hence, break your workflow down into bits, one of which is summation of whatever you want the cumulative sum down
4. throw the result of 3 into the equation
5. any equation can be automated and scripted
6. show your equation and a list of your inputs

[deepa_davis]

[deepa_davis]

but after summation i will get only one value right ? i need in raster form which contain details of each cell