A histogram is a plot that summarizes the underlying frequency of a set of data with the variable of interest on one axis and the frequency distribution of that variable in the other axis. In Partek Flow, histogram can be invoked on continuous or categorical variable.

Invoking a histogram

From a data viewer session, drag the histogram icon onto the data viewer canvas (Figure 1)

Flow Documentation > Histograms > Image1.png

Upon dropping the histogram on the canvas, a dialogue opens up with the different data nodes that can be displayed on the histogram. Select your data node of interest (Figure 2).

Flow Documentation > Histograms > Image2.png

The first row in the data will be displayed by default in the histogram and in this case, it is the histogram of the expression values for the gene A1BG (Figure 3).

Flow Documentation > Histograms > Image3.png

Histogram of Continuous variables

Change the data displayed on the histogram by using the Configuration settings > Content > Data and selecting the desired variable to display. Here the data displayed was switched to “Expressed genes” which is a continuous variable (Figure 4).

Flow Documentation > Histograms > Image4.png

Use the "Sort by" function to sort the plot. The default sorting is by Value on the x-axis and this default setting is sorted in ascending order. Users have the option to change that by changing the Default to value or frequency in the sort option (Figure 5)

Flow Documentation > Histograms > Image5.png

The sort menu was changed to Value in the case below and user can now sort Value by either ascending or descending order. Here the Value of expressed genes is sorted by descending order (Figure 6).

Flow Documentation > Histograms > Image6.png

Users also have the option to bin by either Count or Size. When binned by Count, the user specifies the number of bins for the data and the distribution is fit into the specified number of bins. Data below is binned by Count (Figure 7).

Flow Documentation > Histograms > Image7.png

When binned by Size, the user specifies the number of items in the bin (size of a bin). This is used to calculate the number of bins required for the data. Data below is binned by Size (Figure 8).

Flow Documentation > Histograms > Image8.png

Configuration card (red rectangle in Figure 6) for Pie chart in Flow includes the options:

Data: multiple categorical attributes can be added to data source; Users are allowed to rearrange their order by dragging when having multiple categorical attributes (Figure 7).
Split by: split the current Pie chart by a second categorical attribute (Figure 6)
Color mode: Unique colors (default), Similar colors.
Title: Title name, Title font size (16 px as default)
Style: Order slices by Count or Category

Flow Documentation > Histograms > Fig 6_Configuration and splitted example of Pie chart.png

If more than one categorical attribute were added to the data, Pie chart would have two different modes - Pointer mode and Zoom mode (Figure 7). The default is Pointer mode, so if users would like to look closer at some slice please click the Zoom mode first. ↩ represents Reset zoom.

Flow Documentation > Histograms > Fig 7_Different modes of Pie Chart.png

Once you are pleased with the appearance of the Pie plot, push Save image button to save it to the local machine or click Save button to save the Data Viewer. The resulting dialog (Figure 8) controls the Format,Size and Resolution of the image file. The image will be saved in your favorite format (.svg, .png and .pdf).

Additional Assistance

If you need additional assistance, please visit our support page to submit a help ticket or find phone numbers for regional support.