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I'm trying to create a pie chart with the energy comsumption of some of my electronic devices. I made a simple code for testing: Flow the logic: 1) Receives energy consumption of a cicle (interval) from TV (field 1) and Lights (field 2) [ESP calculates in X seconds how much energy was used and sends it] 2) In 'Field Chart' I select 'Sum' as 'Daily', so each time it receives an energy consumption this value is added to the previous one. Now about the MATLAB Visualization code: I got a pie chart using 'pie(X)' with X being a vector of only 2 numbers (energy from TV and energy from Lights). But the sum of the only two numbers not equals 100%. One thing that I did notice is that the proportion of the yellow and the blue slices is correct (when compared with the values that are displayed at the Field Charts), but I don't know what is the missing part of the pie. Look at the pie chart that I got: My objective is to show how one device affects the total daily consumption in comparison with another device. So, with the last value added to the daily sum of one field I want to use it as a slice of the pie in the chart. So, the objective is a Daily Pie Chart of Energy Consumtion. I'm also getting the message: "Error using Testing (Pie Chart) (line 20). Channel ID must be a positive integer." But my code doesen't even have 20 lines and my Channel ID is a positive integer. The simple code below: readChannelID = 123456; % exemple of how the channelId written in the original code fieldID1 = 1; fieldID2 = 2; readAPIKey = '6RW0V0UCJ7TPV24R'; etv = thingSpeakRead(readChannelID, 'Field', fieldID1, 'NumPoints', 1, 'Readkey', readAPIKey); % energy from TV eil = thingSpeakRead(readChannelID, 'Field', fieldID2, 'NumPoints', 1, 'Readkey', readAPIKey); % energy from illumination X = [etv eil]; pie(X); Thanks for the help and sorry if i made an english mistake. I'm from Brasil.