issue in saving variable values while writing a file with if condition?

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Anil Kumar 2022-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/1641170-issue-in-saving-variable-values-while-writing-a-file-with-if-condition

评论： Anil Kumar 2022-2-3

If I use max and min function the actual values of variable in loops (each data set) are saved for that coresponding max or min through indices q

[p, q]=max(x1(:,4));

However, if I have a general condition (if exp<1) for an expresssion and while saving data for this, the values of first loop (g1 below) are always zero and it never shows actual values.

for ii=1:1
    fid1 = fopen(sprintf('test_1%d.dat',ii),'w' );
    fid2 = fopen(sprintf('test_2%d.dat',ii),'w' );
    fid3= fopen(sprintf('test_3%d.dat',ii),'w' );
    for l1=0.01:s:3
        for l2=0.01:s:1.6
            x10=zeros(1,7);
            x20=zeros(1,7);
            x30=zeros(1,7);
            x1=zeros(1,7);
            x2=zeros(1,7);
            x3=zeros(1,7);
            for g1=0.01:0.01:0.5
                for g2=0.01:0.01:0.5
                    for g3=0.01:0.01:0.5
                        %some calculations epx1 exp2 exp3.....
                        if(exp1<1)
                            x1=[x1; g1 g2 g3 exp1 exp2 exp3 exp4];
                        end
                        if(exp2<1)
                            x2=[x2; g1 g2 g3 exp1 exp2 exp3 exp4];
                        end
                        if(exp3<1)
                            x3=[x3; g1 g2 g3 exp1 exp2 exp3 exp4];
                        end
                    end%g3
                end%g2
            end%g1
            % [p, q]=max(x1(:,4)) actually saves values of gi through q
%             Even if i put if condition here, the results remains the same
%                         if(exp1<1)
% x10=x1; x20=x2; x30=x3;
%         end
            x10=x1; x20=x2; x30=x3;
            g10=x10(1);
            g20=x10(2);
            g30=x10(3);
            .
            .
            g101=x20(1);
            .
            .
            if(exp1>0.001)
                fprintf(fid1,'%f ...\r\n',l1,l2,g10,g20,g30,exp1,exp2,exp3,exp4);
            end
            if(exp2>0.001)
                fprintf(fid2,'%f ...\r\n',l1,l2,g101,g201,g301,exp1,exp2,exp3,exp4);
            end
            if(exp3>0.001)
                fprintf(fid3,'%f ...\r\n',l1,l2,g100,g200,g300,exp1,exp2,exp3,exp4);
            end
        end%l2
    end%l1
    fclose(fid1);
    fclose(fid2);
    fclose(fid3);
end

How can I see actual values of the data set (e.g. gis for each value of l1 and l2) where the given condition is fullfilled? I have doubt that other calculated values of expressions may be wrong too due to the previous issue. Kindly help what am I doing wrong here while saving and retreiving data from x1, x2 and x3. Thanks!

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Ankit 2022-2-3

编辑：Ankit 2022-2-3

在 MATLAB Online 中打开

clc
x10=zeros(1,7);
x20=zeros(1,7);
x30=zeros(1,7);
x1=zeros(1,7);
x2=zeros(1,7);
x3=zeros(1,7);
for ii=1:1
    fid1 = fopen(sprintf('tt1%d.dat',ii),'w' );
    fid2 = fopen(sprintf('tt2%d.dat',ii),'w' );
    fid3= fopen(sprintf('tt3%d.dat',ii),'w' );
    for l1=0.01:0.1:3
        for l2=0.01:0.1:1.6
            for g1=0.01:0.1:0.5
                for g2=0.01:0.1:0.5
                    for g3=0.01:0.1:0.5
                        
                        %some calculations epx1 exp2 exp3.....
                        exp1=l1^2+l2^2-g1*(g2+g3);
                        exp2=l1^2+l2^2-2*g2*(g1+g3);
                        exp3=2*l1^2+l2^2-g3*(g1+g2);
                        exp4=2*l1^2-l2^2-g3*(g1+g2);
                        
                        if(exp1<1)
                            x1=[x1; g1 g2 g3 exp1 exp2 exp3 exp4];
                        end
                        if(exp2<1)
                            x2=[x2; g1 g2 g3 exp1 exp2 exp3 exp4];
                        end
                        
                        if(exp3<1)
                            x3=[x3; g1 g2 g3 exp1 exp2 exp3 exp4];
                        end
                        
                    end%g3
                end%g2
            end%g1
            
            x10=x1; x20=x2; x30=x3;
            g10=x10(:,1);
            g20=x10(:,2);
            g30=x10(:,3);
            exp1=x10(:,4);
            exp2=x10(:,5);
            exp3=x10(:,6);
            exp4=x10(:,7);
            
            g101=x20(:,1);
            g201=x20(:,2);
            g301=x20(:,3);
            exp11=x20(:,4);
            exp21=x20(:,5);
            exp31=x20(:,6);
            exp41=x20(:,7);
            
            g100=x30(:,1);
            g200=x30(:,2);
            g300=x30(:,3);
            exp12=x30(:,4);
            exp22=x30(:,5);
            exp32=x30(:,6);
            exp42=x30(:,7);
            if(exp1>0.01)
                fprintf(fid1,'%f %f %f %f %f %f %f %f %f\r\n',l1,l2,g10,g20,g30,exp1,exp2,exp3,exp4);
            end
            
            if(exp2>0.01)
                fprintf(fid2,'%f %f %f %f %f %f %f %f %f \r\n',l1,l2,g101,g201,g301,exp11,exp21,exp31,exp41);
            end
            
            if(exp3>0.01)
                fprintf(fid3,'%f %f %f %f %f %f %f %f %f\r\n',l1,l2,g100,g200,g300,exp12,exp22,exp32,exp42);
            end
            
        end%l2
    end%l1
    fclose(fid1);
    fclose(fid2);
    fclose(fid3);
end

Ankit 2022-2-3

'Index in position 2 exceeds array bounds' - you will get this error when you are trying to access the index which is not defined . As i mentioned it doesn't matter where you define..

This result due to the fact that the index number is more than the array elements.

what are you reading from these *.dat files?

Anil Kumar 2022-2-3

Dear Ankit, I am plotting those expressions w.r.t col. 1 and I want to see corresponding values of inner loop (l2, g1,g2 and g3) for those expressions. I guess it makes sense now why I need g1 values. I think I am doing some silly mistake while saving data.

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issue in saving variable values while writing a file with if condition?

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issue in saving variable values while writing a file with if condition?

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