Project: s41467-023-44321-9 | Function: mblm_slopes_pval (r)

system: You are an expert R programmer implementing algorithms from scientific papers.
Complete the masked function based on the algorithm description.
Follow R best practices and maintain consistent code style.
Return **only** the complete R function code.

user: Complete this R function:

**DESCRIPTION:** Calculates Theil-Sen slopes and p-values for time series data using Mann-Kendall trend test with the mblm package. Iterates through rows of data to compute trends for each species across time periods.

**KEY TERMS:** {
  "slopes": "rates of change",
  "pvals": "statistical significance",
  "species": "tree species",
  "y": "threat values over time",
  "x": "time points"
}

**CONTEXT CODE:** ######################
## This file is created by S. Hoeks - any questions should be directed to him, s.hoeks@science.ru.nl
######################

mblm_slopes_pval = function(data, cols) {
  stop("Function implementation has been masked")
}

histm = function(x,xlim,breaks){
    png()
    hist(x,xlim=xlim,breaks=breaks)
    dev.off()
}

match_no_na = function(x,y){
    m = match(x,y)
    m = m[complete.cases(m)]
    return(m)
}

Complete the function implementation replacing "stop("Not implemented")".