ThingSpeak

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So i have been getting this error for quite a long and i don't know whats the problem in the code. Refer to the code, I have to plot the waveform of the data that is stored in the z variable after concatenation of several strings. The point is to get data from 8 different fields of same channel in Thingspeak platform. So far I have received data from the all fields and make a single string of the data. In the end, when I try to plot it prompt me with the following error and does not plot the data. ======> "Undefined function 'real' for input arguments of type 'string' Error" <====== Can somebody please guide me how to remove this error as I am not very familiar with MATLAB coding. Any help will be really appreciated. data1=thingSpeakRead(readChannelID,'Fields',[1],'NumPoint',1,'OutputFormat','timetable'); data2=thingSpeakRead(readChannelID,'Fields',[2],'NumPoint',1,'OutputFormat','timetable'); data3=thingSpeakRead(readChannelID,'Fields',[3],'NumPoint',1,'OutputFormat','timetable'); data4=thingSpeakRead(readChannelID,'Fields',[4],'NumPoint',1,'OutputFormat','timetable'); data5=thingSpeakRead(readChannelID,'Fields',[5],'NumPoint',1,'OutputFormat','timetable'); data6=thingSpeakRead(readChannelID,'Fields',[6],'NumPoint',1,'OutputFormat','timetable'); data7=thingSpeakRead(readChannelID,'Fields',[7],'NumPoint',1,'OutputFormat','timetable'); data8=thingSpeakRead(readChannelID,'Fields',[8],'NumPoint',1,'OutputFormat','timetable'); L=string(data1.test1); L1=extractBefore(L,"/"); x1=strsplit(L1,' '); M=string(data2.test2); M1=extractBefore(M,"/"); x2=strsplit(M1,' '); N=string(data3.test3); N1=extractBefore(N,"/"); x3=strsplit(N1,' '); O=string(data4.test4); O1=extractBefore(O,"/"); x4=strsplit(O1,' '); P=string(data5.test5); P1=extractBefore(P,"/"); x5=strsplit(P1,' '); Q=string(data6.test6); Q1=extractBefore(Q,"/"); x6=strsplit(Q1,' '); R=string(data7.test7); R1=extractBefore(R,"/"); x7=strsplit(R1,' '); S=string(data8.test8); x8=strsplit(S,' '); z=cat(2,x1,x2,x3,x4,x5,x6,x7,x8) thingSpeakPlot(z)