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Access a workspace, loaded in the Workspaces Toolbox, inside a script:
from mantid.api import AnalysisDataService as ADS
ws = ADS.retrieve('ws')
Or simply:
ws = mtd['ws']
# ADS import not needed
MatrixWorkspaces can undergo basic algebra using an algorithm: Plus v1, Minus v1, Multiply v1, Divide v1.
As a shorthand, use +,-,*,/ with either number or another workspace as the second argument
w1 = mtd['workspace1']
w2 = mtd['workspace2']
# Sum the two workspaces and place the output into a third
w3 = w1 + w2
# Multiply the new workspace by 2 and place the output into a new workspace
w4 = w3 * 2
Replace an input workspaces using +=,-=,*=,/= e.g.
# Multiply a workspace by 2 and replace w1 with the output
w1 *= 2.0
# Add 'workspace2' to 'workspace1' and replace 'workspace1' with the output
w1 += w2