MATLAB: Hi.. Do anybody knows, how to fit a custome equation for multiple curves at the same time.

curve fittingCurve Fitting Toolbox

i have to get the coefficients of plot for 760 curves with the same custome equation. Equation includes two coefficients and it is a custome exponential curve. All the datas are 2D and in separate .csv file. Thank you in advance

Best Answer

lsqcurvefit can be used to fit N-dimensional curves (for you N=760).

https://www.mathworks.com/matlabcentral/answers/431697-make-curve-fitting-faster#comment_687701

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MATLAB: Does anybody know

str2double(sprintf('%d',V))

str2double(char(V+'0'))

which should be more efficient.

Warning: if your vectors might have 15 to 19 elements, then there would be additional work involved in order to get the correct integer. From 19 elements up, only an approximation of the integer can be produced.

MATLAB: Sorting unique date by time.

Hello Haolun, here is the logic..

% Assumming input Data be like this..

% first column is 'ID', second Column is 'date', third column is 'price'
inputData =[
            11    21062019   1000
            11    22062019   1500
            11    23062019   2000
            11    24062019   2500
            22    21062019   3000
            22    22062019   3500
            22    23062019   4000
            22    24062019   4500
            33    21062019   5000
            33    22062019   5500
            33    23062019   6000
            33    24062019   6500];

IDs =unique(inputData(:,1));
Dates = unique(inputData(:,2));

totalIDs = length(IDs);
totalDates = length(Dates);

% logic to create output data

% First item of output will be empty
outputData{1,1} = [];

% This FOR loop is for first row (row of IDs)
for count1 = 1:totalIDs
    outputData{1,count1+1} = IDs(count1);
end

% This FOR loop is for first column (column of Dates)
for count2 = 1:totalDates
    outputData{count2+1,1} = Dates(count2);
end

% This For loop is for intermediate values
for count1 = 1:totalIDs
    for count2 = 1:totalDates
                
        ID_val = IDs(count1);
        Date_val = Dates(count2);
        
        ID_Column_Indices = find(ismember(inputData(:,1),ID_val));
        Date_Column_Indices = find(ismember(inputData(:,2),Date_val));
        
        require_price_val = [];
        for i=1:length(ID_Column_Indices)
            for j=1:length(Date_Column_Indices)
                if ID_Column_Indices(i)==Date_Column_Indices(j)
                    index = ID_Column_Indices(i);
                    require_price_val = inputData(index,3);
                end
            end
        end       
        outputData{count2+1,count1+1} = require_price_val;
    end
end
inputData % to display input data
outputData % to display output data

% Output data will be display as..

 outputData = 
 
             []    [  11]    [  22]    [  33]
     [21062019]    [1000]    [3000]    [5000]
     [22062019]    [1500]    [3500]    [5500]
     [23062019]    [2000]    [4000]    [6000]
     [24062019]    [2500]    [4500]    [6500]

Please see attached script and run it and see the result.. Thanksss... :)

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MATLAB: Does anybody know

MATLAB: Sorting unique date by time.

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