when i tried run something from excel it shows error?

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Logeswaran pitchai muthaiyah
评论： Logeswaran pitchai muthaiyah 2020-12-1
%load('Ftr.mat'); %load first 1000 data
Data=xlsread('data.xlsx','Sheet1');
Ftrain= Data(1:1:990);
Ftest=Data(1:1:1000);
when i run this. i got this error.
>> Ftrain= Data(1:1:990)
Subscripting into a table using one subscript (as in t(i)) or three or more subscripts (as in t(i,j,k)) is
not supported. Always specify a row subscript and a variable subscript, as in t(rows,vars).

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回答（1 个）

Walter Roberson
Walter Roberson 2020-12-1
Ftrain = Data(1:990, :);
Ftest = Data(991:1000, :);
Note that this will return the same datatype that Data is -- if Data is a table then Ftrain and Ftest will be tables as well.
Your code shows you using xlsread() but xlsread() can never return table objects. The first output of xlsread() is strictly numeric. You would have had to have used readtable() to get a table returned.
See also readmatrix()
  2 个评论
Logeswaran pitchai muthaiyah
Logeswaran pitchai muthaiyah 2020-12-1
data = xlsread('data.xlsx','Sheet1');
Ftrain= data(1:1:990);
Ftest=data(1:1:1000);
X=Ftrain;
[n,p] = size(X); %n = number of observations/samples
%mean
c=mean(X);
;
%standard deviation
d=std(X);
%Upper control limimt
UCL=c+3*d;
x=repmat(UCL,n,1);
when i tried to run mean it shows one error.
c=mean(X)
Error using sum
Invalid data type. First argument must be numeric or logical.
Error in mean (line 127)
y = sum(x, dim, flag) ./ mysize(x,dim);

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