Update demo

message_ix_models/tools/costs/demo.py

@@ -3,10 +3,10 @@
 # By default, the create_cost_projections() function will run for R12, with NAM as
 # reference region, using GDP as the cost driver, and the updated data version.
 # The function will also run for all SSP scenarios, and for all years from 2021 to 2100.
-default = create_cost_projections()
+inv, fix = create_cost_projections()
 
 # Example 1: Get cost projections for SSP2 scenario in R12, using GDP (updated data)
-r12_gdp_ssp2 = create_cost_projections(
+inv, fix = create_cost_projections(
     sel_node="r12",
     sel_ref_region="R12_NAM",
     sel_base_year=2021,
@@ -17,7 +17,7 @@
 
 # Example 2: Get cost projections in R11 (with WEU as reference region), using learning
 # (this will run for all SSP scenarios)
-r11_learning = create_cost_projections(
+inv, fix = create_cost_projections(
     sel_node="r11",
     sel_ref_region="R11_WEU",
     sel_base_year=2021,
@@ -26,11 +26,11 @@
 )
 
 # Example 3: Get cost projections in R12, using convergence
-r12_convergence = create_cost_projections(
+inv, fix = create_cost_projections(
     sel_node="r12",
     sel_base_year=2021,
     sel_method="convergence",
 )
 
 # Example 4: Get cost projections in R11 using previous/original SSP scenarios
-r11_previous = create_cost_projections(sel_node="r11", sel_scenario_version="original")
+inv, fix = create_cost_projections(sel_node="r11", sel_scenario_version="original")