sequential files(write, read ,append)?

I'm having trouble understanding why my program wont work. I'm given an array of numbers. This is what i should be getting

45 66 78 23 41 55 88 66 99 24 74 88 -these should be in a vertical column

The number of lines of the integers is 12.

The max number is 99 in line 9.

The min number is 23 in line 4.

Heres what i have:

      fid1=fopen('hw9.txt','w');
      for x=[45 66 78 23 41 55 88 66 99 24 74 88]
          fprintf(fid1,'%g\n',x);
      end
      fclose(fid1);

      fid1=fopen('hw9.txt','r');
      [numbers count] = fscanf(fid1,'%d');
      [value index]=max(x);
      [value2 index2]=min(x);
      fclose(fid1);
      disp(numbers)
      fprintf('The number of lines of intergers is %g.\n',count)
      fprintf('The max number is %g in line %g.\n',value,count)
      fprintf('The min number is %g in line %g.\n',value2,index2)

Is the max function counting most common numbers?

Answer 1

[Paulo Silva]

Your code had some mistakes, here's the fixed code

        %create the file and write values to it
        fid1=fopen('hw9.txt','w');
        for x=[45 66 78 23 41 55 88 66 99 24 74 88]
            fprintf(fid1,'%g\n',x);
        end
        %the for loop writes every value to the file, last one is 88, x=88
        fclose(fid1);
        %read the values inside the file
        fid1=fopen('hw9.txt','r');
        [numbers count] = fscanf(fid1,'%d');
        [value index]=max(numbers); %replaced x by numbers, x value is 88
        [value2 index2]=min(numbers); %same as above
        fclose(fid1);
        disp(numbers)
        fprintf('The number of lines of intergers is %g.\n',count)
        %in the next line you had count instead of index (strange mistake)
        fprintf('The max number is %g in line %g.\n',value,index) 
        fprintf('The min number is %g in line %g.\n',value2,index2)

The max function finds the maximum value of the vector, the min finds the minimum value of the vector.

One extra feature that you might want is

    fprintf('Unique Values and the times they appear\n')
    disp([unique(numbers), histc(numbers,unique(numbers))])

[Kyle]

Oh i see what i forgot. Quick question though, are count and numbers considered matlab variables or can they be changed to say [x y]=fscanf(fid1,'%d');

[Paulo Silva]

yes they are variables, choose the name that best describes what they are for and avoid using the same names as matlab functions.