Функция карт в excel

The MAP function «maps» a custom LAMBDA function to each value in a supplied array. The LAMBDA is applied to each value, and the result from MAP is an array of results with the same dimensions as the original array.

The MAP function is useful when you want to process each item in an array individually but as an array operation that yields an array result. MAP is also useful when the formula logic is complex and would be best managed in a single location. Using a named LAMBDA function with MAP is possible to reuse the same code elsewhere.

The MAP function takes two required arguments: array1 and lambda. Array1 is the array that should be mapped. Lambda is the custom lambda function that should be run on each item in array1. Additional arguments can be added in the form of array2, array3, etc. before lambda, which must always be the last argument provided. When additional arrays are provided to MAP, the LAMBDA function must be configured to accept additional arguments. Array1 should be the first argument in the LAMBDA, array2 should be the second argument, etc.

Examples

The MAP function maps each value in an array to a custom LAMBDA function. For example, the formula below maps a LAMBDA function that simply adds 1 to each item in the supplied array:

=MAP({1,2,3},LAMBDA(a,a+1)) // returns {2,3,4}

The variable a passed into the LAMBDA function as the first argument is array1 in the MAP function.

Remove non-numeric values

In the worksheet shown above, MAP is used to remove non-numeric values from the array provided (B5:D16). The formula in F5 is:

=MAP(B5:D16,LAMBDA(a,IF(ISNUMBER(a),+a,"")))

Because array1 has 12 rows and 3 columns, the result from MAP is a 12 x 3 array that spills into the range F5:H16.

Note: the +a notation is used to force Excel to coerce a from a range reference to an array of values. Without the +, MAP will return a #CALC! error. This step is sometimes necessary when working with array formulas that spill.

Additional arrays

MAP can accept additional arrays that can be used by the LAMBDA during calculation. The formula below adds each item in array1 to the corresponding item in array2:

=MAP({1,2,3},{1,2,3},LAMBDA(a,b,a+b)) // returns {2,4,6}

Here, the variable a given to the LAMBDA function is array1 in  the MAP function, and b is array2.

When to use MAP

The dynamic array engine in Excel can handle many array operations natively without a function like MAP. For example, the formulas below both return the same result:

=array+1
=MAP(array,LAMBDA(a,a+1))

As such, there is no particular reason to use MAP when a native array operation will achieve the same result. However, there are cases where MAP can be useful:

1. To run logical tests with the AND and OR functions. These functions aggregate arrays to a single value, so normally they can be used in array operations that need to maintain multiple values.

2. To perform certain aggregate operations on multiple arrays, i.e.

   =MAP(rng1,rng2,rng3,LAMBDA(a,b,c,MAX(a,b,c)))
   

3. To make a function spill that otherwise won’t.

Note: The MAP function returns an array of results. See the REDUCE function if you want to process each item in an array individually but you want a single aggregated result.

Как визуализировать данные в Excel. Часть 2

Excel has built-in support for adding chart and map combinations — also as known as map charts — since Excel 2016. A map chart is an easy-to-use tool that is great for when you want to visualize geographic data on a map. In this article, we are going to show you how to insert an Excel map chart.

Download Workbook

Requirements

First of all, you need an active internet connection to connect to the Bing Map service. You can create a new map or append data into an existing one only if you have an online connection.

Second, you need a structured data to use in the map chart. An Excel map chart can accept geographical regions, like countries/regions, states, counties, or postal codes.

To be perfectly blunt, Excel map chart is not perfect, and you might have issues to get Excel to recognize geographical region names. Also, a common issue here is that some location names are used for multiple places around the workld. This is called Disambiguation. For example, there are 31 counties named Washington County in US.

To avoid these type of issues, include higher level information in your data set, such as state or country names.

Map types

You can display two types of information on Excel map charts:

• Value
• Category

The determining factor for this is the type of the data itself. If you have numbers (values) as measurements, Excel displays values by using a gradient spectrum of two or three colors.

Alternatively, you can use labels (categories) as measurements. This type of data will be represented by different kind of colors, and not in gradual colors.

Inserting a map chart

Once your data is ready, you can go ahead and insert an Excel map chart.

1. Start by selecting your data. Selecting a single cell also works if your data is structured correctly in a table format.
2. Click on Maps under Insert > Charts
3. Click Filled Maps

Excel will create either a value or category map based on your dataset.

Customization

Just like in charts, you can use the same approach to access customization options.

1. Right-click anywhere on the plot area of the map
2. Click the Format Data Series option in the context menu

This action will open the options pane on the right.

You have options of changing map projections and areas displayed in the map as well as labels. Available map projections are:

• Mercator
• Miller
• Albers

Below is a demonstration of different map areas available.

Expand and use Series Color section to customize coloring of data in your map chart.