Data Inspector

Data inspector - is an Engee application designed to work with the results of both a single simulation and multiple simulations, i.e. comparative analysis of the results of multiple model runs.

The two main usage scenarios of Engee Data Inspector are:

Analyses of different signals of the same model, including comparative analyses (comparing different signals of the same model).
Comparative analysis of the results of different runs of the same model (comparison of the same signal but with different model runs).

To open the application, go to the Engee workspace and in the upper left corner under Engee applications select Data inspector :

data inspector 1

Interface

The application runs in a separate browser tab and has the following appearance by default:

data inspector 2

The window consists of two areas: signals (1) and graphs (2). Let’s consider them in detail.

Signals area

The signals area contains all signals of all model runs.

To analyse a signal after simulation, you must mark it as recordable before you run the model. To do this, click on the signal line and select the icon records signal logging 1 :

graph logging 1

Data inspector allows you to work with user sessions to simplify data analysis. A session is a set of parameters in .ngdat format, which includes:

Configuration plot windows - saving the axis location, number of rows and columns in the grid;
Displaying specific signals on selected axes, including a colour scheme;
Saving current runs and their comparisons for further analysis.

You can save and load sessions in the application:

data inspector sessions

Loading the session - when loading a saved session, the data inspector completely restores the previously saved configuration.

When loading a session, you can select:
- Completely clear the current runs and replace them with data from the loaded session;
- Send the current run to the archive, making active the run from the loaded session. Archived runs from the session are added to the general archive.
Saving the session - is the process of capturing the current configuration of the data inspector, including settings for charts, signals, and runs.

It is necessary to decide which runs to save: all available or selected (ticked). By default, the session is saved in the /user directory with the name sessionName. Saved sessions will be available in file browser .

In the data inspector, the signals are grouped by run.

data inspector 4

The active run is shown in the upper part of the signals area, all other runs are collected below in the Archive. Clicking on a run name will expand its properties window:

data inspector settings 1

Options are available in the run panel:

Comment - here you can describe the features of a particular run, this will help when comparing it with other runs.
Save - all run signals can be saved to a CSV file:
Delete - deleting a run from the Data Inspector.

You can delete all archive runs by pressing the button Clear:

data inspector 5

Changing the colour and style of the line is available for each signal. To do this, click on the coloured bar to the right of the signal name:

data inspector 6

The check box to the left of the signal name is used to display the signal on the selected coordinate plane.

Graphs area

The selected signals are displayed in the graphs area. When you move the mouse over the coordinate plane, the toolbar appears:

data inspector 7

Signal Menu - opens a menu with a choice of signal display type. Available are signals in time domain and dependence of one signal on another .
Zoom - scales the coordinate plane. You can select an area and zoom in on its contents. To return the scale by default, double-click the coordinate plane with the left mouse button.
Pan - tool for moving the chart on the coordinate plane. Allows you to move the chart in any direction using the mouse cursor.
Zoom in - zooms the coordinate plane.
Zoom out - zooms out the coordinate plane.
Autoscale - returns the coordinate plane scale value by default.
Download plot as a png - saves the coordinate plane to a PNG file.
One cursor - displays values on the chart when the mouse pointer is hovered over it.
Two cursors - displays values on all charts.
Copy to clipboard - copies the coordinate plane to the clipboard. You can paste the plane into Engee and other third-party programmes.
Clear - deletes the graph from the coordinate plane.

In addition to the main set of tools, two buttons are available to you:

Axes arrangement - allows you to customise the graph output field. You can choose graph layout templates from the basic presets or customise them yourself.
Settings - enables/disables the display of the signal name legend on the coordinate plane.

Storing/loading runs

Results obtained with the Data Inspector can be saved to a CSV file:

data inspector wa 3

The file will be saved at the path /user/run_data. It is recommended to save the results of all important runs to be able to restore them if necessary. If runs have been deleted from the archive or are not available for reanalysis in the inspector, they can be loaded and replayed again using WorkspaceArray:

Use the function to clean up the CSV file headers and write them to the WorkspaceArray. The function will remove unnecessary prefixes, numbers and spaces (the file header to be exported to WorkspaceArray should contain only time and value column names without spaces):

function clean_csv_header(file_path::String)
    # Читаем строки из файла
    lines = readlines(file_path)

    # проверка целостности CSV-файла
    if !isempty(lines)
        # Удаляем префиксы, цифры и лишние пробелы из заголовка
        cleaned_header = join([strip(replace(split(col, ".") |> last, r"\d+" => "")) for col in split(lines[1], '\t')], '\t')

        # перезапись файла
        open(file_path, "w") do file
            write(file, cleaned_header * "\n")
            write(file, join(lines[2:end], "\n"))
        end
    else
        error("Файл пустой.")
    end
end

file_path = "/user/run_data/my_file.csv" #путь к CSV-файлу


clean_csv_header(file_path) #очищение заголовка

workspacecsv = WorkspaceArray("workspacearray_csv", "/user/run_data/my_file.csv") #запись в WorkspaceArray

Open the Data Inspector, where the WorkspaceArray variable containing the simulation or run data is displayed in the last run:

Usage Examples

Analysing the results of a single simulation

Consider the following model for an example:

data inspector 8

The output signals of the Sine Wave Function and Bias blocks are marked as monitored. After the model simulation is complete, they can be seen in the Data Inspector:

data inspector 9

To add a graph of the signal to the coordinate plane, select the checkbox next to the signal name:

data inspector 11

Optionally, you can customise the graph output field. Click the axis layout button and select a template with two smaller graphs on the left and one larger one on the right:

preset example 1

The values of the signals are visible when you hover the mouse over the graph. You can compare signals on one chart. To do this:

Tick the checkboxes of the signals that we want to compare.
Enable data comparison when hovering .

On mouse-over, the values of both signals are displayed:

data inspector 12

Comparison of several model runs

Data inspector allows you to compare several model runs with each other. This is convenient, for example, to analyse the influence of a single parameter (or a group of parameters) on the behaviour of the model as a whole.

Let’s change the parameter value in the Bias block and run the simulation. After completion of the simulation in the Data Inspector, the new run is relevant, and the previous one is available in the list Archive:

data inspector 13

Signals from different runs can be compared to each other in the same way as signals from the same model:

data inspector 14

Runs and signals can be compared via the tab Comparisons. Runs are compared within one model:

data inspector run comparison

Signals can be compared from different models and runs:

data inspector signals comparison