EconGeo (version 2.0)

entry_mat: Generate a matrix of entry events from two regions - industries matrices (same matrix composition from two different periods)

Description

This function generates a matrix of entry events from two regions - industries matrices (different matrix compositions are allowed)

Usage

entry_mat(mat1, mat2)

Value

A matrix representing the entry events from two regions - industries matrices, with rows representing regions and columns representing industries

Arguments

mat1

An incidence matrix with regions in rows and industries in columns (period 1)

mat2

An incidence matrix with regions in rows and industries in columns (period 2)

Author

Pierre-Alexandre Balland
Wolf-Hendrik Uhlbach

References

Boschma, R., Balland, P.A. and Kogler, D. (2015) Relatedness and Technological Change in Cities: The rise and fall of technological knowledge in U.S. metropolitan areas from 1981 to 2010, Industrial and Corporate Change 24 (1): 223-250

Boschma, R., Heimeriks, G. and Balland, P.A. (2014) Scientific Knowledge Dynamics and Relatedness in Bio-Tech Cities, Research Policy 43 (1): 107-114

See Also

growth_list, entry_list, exit_list

Examples

## generate a first region - industry matrix in which cells represent the presence/absence
## of a RCA (period 1)
set.seed(31)
mat1 <- matrix(sample(0:1, 20, replace = TRUE), ncol = 4)
rownames(mat1) <- c("R1", "R2", "R3", "R4", "R5")
colnames(mat1) <- c("I1", "I2", "I3", "I4")

## generate a second region - industry matrix in which cells represent the presence/absence
## of a RCA (period 2)
mat2 <- mat1
mat2[3, 1] <- 1


## run the function
entry_mat(mat1, mat2)