thr_peaks {gcxgclab}

Threshold Peaks

Description

thr_peaks finds all peaks above the given threshold.

Usage

thr_peaks(TIC_df, THR = 1e+05)

Arguments

TIC_df

a data.frame object. Data frame with 4 columns (Overall Time Index, RT1, RT2, TIC), ideally the output from create_df(), or the first data frame returned from extract_data(), $TIC_df.

THR

a float object. Threshold for peak intensity. Should be a number between the baseline value and the highest peak intensity. Default suggestion is THR = 100000.

Details

This function finds all peaks in the sample above a given intensity threshold.

Value

A data.frame object. A data frame with 4 columns (Time, X, Y, Peak) with all peaks above the given threshold, with their time coordinates.

Examples

file1 <- system.file("extdata","sample1.cdf",package="gcxgclab")
frame <- extract_data(file1,mod_t=.5)
thrpeaks <- thr_peaks(frame$TIC_df, 100000)
plot_peak(thrpeaks, frame, title="Peaks Above 100,000")
plot_peakonly(thrpeaks,title="Peaks Above 100,000")