txt file and matlab??? help

okay so i have to use a function that i created to change a list of numbers in the text file. the list of numbers are pound and inchs and i have to convert them to cm and kg, however every time i use the function program it changes the whole list into centimetre instead of changing it into centimetre and kilogram. any help would be great. so my function is :

function[centimeter,kilogram]=IPtoCK(inch,pound)

for k=1:44;

if k<=77.4

centimeter=(inch.*2.54);

else

kilogram=(pound.*0.4536);

end

end

end

Answer 1

[Star Strider]

That’s a fairly complicated file to read, but this works:

fidi = fopen('heightweight.txt');
D = textscan(fidi, '%f%f', 'HeaderLines',8, 'TreatAsEmpty',{'\' '}'}, 'EndOfLine','\r\n');
fclose(fidi);
inch = D{1};
inch = inch(~isnan(inch));
pound = D{2};
pound = pound(~isnan(pound));

Then expressing your function (saving it to IPtoCK.m) as:

function [centimeter,kilogram]=IPtoCK(inch,pound)
centimeter=(inch.*2.54);
kilogram=(pound.*0.4536);
end

and calling it as:

[centimeter,kilogram]=IPtoCK(inch,pound)

is all you need.

[Image Analyst]

So, with help from the others, here's the complete program (hope this was not your homework).

function test2  % Call the m-file whatever you want.
try
  fidi = fopen('heightweight.txt');
  D = textscan(fidi, '%f%f', 'HeaderLines',8, 'TreatAsEmpty',{'\' '}'}, 'EndOfLine','\r\n');
  fclose(fidi);
  height = D{1}(1:44);
  height = height(~isnan(height))
  weight = D{2};
  weight = weight(~isnan(weight))
  
  [cm, kg] = IPtoCK(height, weight);
  fid=fopen('convert.txt', 'wt');
  fprintf(fid,'Height [cm] Weight [kg]\n', cm, kg);
  fprintf(fid,'%11.3f %11.3f\n', cm, kg);
  fclose(fid);
catch ME
  errorMessage = sprintf('Error in function %s() at line %d.\n\nError Message:\n%s', ...
    ME.stack(1).name, ME.stack(1).line, ME.message);
  fprintf(1, '%s\n', errorMessage);
  WarnUser(errorMessage);
end

function[centimeter,kilogram]=IPtoCK(inch,pound)
try
  centimeter = inch .* 2.54;
  kilogram   = pound .* 0.4536;
catch ME
  errorMessage = sprintf('Error in function %s() at line %d.\n\nError Message:\n%s', ...
    ME.stack(1).name, ME.stack(1).line, ME.message);
  fprintf(1, '%s\n', errorMessage);
  WarnUser(errorMessage);
end

function WarnUser(errorMessage)
uiwait(warndlg(warningMessage));

Answer 2

[Jan]

Look at this piece of code:

for k=1:44
   if k <= 77.4
      ...

k goes from 1 to 44. Then k is smaller equal 77.4 in every case.

In addition it is not clear, why you use a loop at all, because the contents of the loop does not depend on the loop counter. I guess this would help:

function [centimeter,kilogram]=IPtoCK(inch,pound)
centimeter = inch .* 2.54;
kilogram   = pound .* 0.4536;

[dena hosseini]

when i do it like this:

function[centimeter,kilogram]=IPtoCK(inch,pound)
    centimeter = inch .* 2.54;
    kilogram   = pound .* 0.4536;
end

it gives an error, saying not enough input argument. this is what i write in my script file: The heightweight.txt is the text file that contains the list of numbers

v=load('heightweight.txt');
z=IPtoCK(v);
fid=fopen('convert.txt', 'w');
fprintf(fid,'%.3f  \n',z);
fclose(fid);

[Image Analyst]

It requires two arguments, not one. You passed in only one, called v. You need to extract inch and pound. Maybe like this, depending on what v is:

inches = v.inch;
pounds = v.pound;
[cm, kg] = IPtoCK(inches, pounds);
fid=fopen('convert.txt', 'wt');
fprintf(fid,'%.3f  %.3f\n', cm, kg);
fclose(fid);