Error in mapminmax.reverse

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fariha Shahid
fariha Shahid 2021-3-29
回答： Harshavardhan 2025-4-4
Hello everyone,
I am working on ANN code and I have to predict 365 data points ahead. I am scaling up the data between -1 and 1 using mapminmax command. The problem is that input data points are 150000 in number where as the predicted output has 365 data points. Thus I am facing a mismatch in dimension when applying reverse mapminmax command.
Data=load('Karachi_corr.csv');
length(Data);
x= Data(:,1:11);
y= Data(:,12);
[x2,PS] = mapminmax(x); % (150000x11)
y2 = mapminmax('apply',y,PS); % (150000x1)
% ANN Code
yPred_rev = mapminmax('reverse',yPred2,PS); % (365x1) double
Errors that it is giving me are
Error using bsxfun
Non-singleton dimensions of the two input arrays must match each other.
Error in mapminmax.reverse (line 7)
x = bsxfun(@rdivide,x,settings.gain);
Error in nnet7.process_fcn (line 41)
out1 = info.reverse(in2,out2);
Error in mapminmax (line 46)
y = nnet7.process_fcn(mfilename,x,varargin{:});
Error in ANN_Func (line 130)
yPred_rev = mapminmax('reverse',yPred2,PS);

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回答（1 个）

Harshavardhan
Harshavardhan 2025-4-4
Hi @fariha Shahid
To address the dimension mismatch issue in your ANN prediction, ensure you scale your input and output separately using "mapminmax".
[x2, PSx] = mapminmax(x'); % Transpose for compatibility
[y2, PSy] = mapminmax(y'); % Transpose for compatibility
% ANN Code to predict yPred2
% Reverse scaling of predicted output
yPred_rev = mapminmax('reverse', yPred2, PSy);
For more information on “mapminmax” you can type the following command in a MALTAB command window
doc mapminmax
Hope this helps.

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