Reading data from a different URL each iteration

i am trying to read some data from a specific website, in this website there are some parametrs that we need to set to get the desired data, now reading the data for manually speccifed parametrs is an easy job. Now I am trying to automate this proceess such that the parametrs would be changed accordingly and the data for each set of parameters would be read directly without my interaction. to do that I have the follwoing URL that I am reading the data from

httpUrl  = "https://lgdc.uml.edu/common/DIDBGetValues?ursiCode=JI91J&charName=foF2,foF1,foE,foEs,hmF2,hmF1,hmE" + ...
    "&DMUF=3000&fromDate=1997%2F01%2F01+00%3A00%3A00&toDate=1997%2F12%2F31+11%3A59%3A00";

where the parameters that need to be changed in the URL every time are the following

fromDate=1997%2F01%2F01+00%3A00%3A00  % where we need to change the year eveery time which is here =1997

which represent the starting date of the desired data and

toDate=1997%2F12%2F31+11%3A59%3A00    % where we need to change the year eveery time which is here =1997

which represent the ending date of the desired data. I strated with the follwoing lines but I am not sure how I can make the URL change every time and store all the read data in a table at the end.

httpUrl  = "https://lgdc.uml.edu/common/DIDBGetValues?ursiCode=JI91J&charName=foF2,foF1,foE,foEs,hmF2,hmF1,hmE" + ...
    "&DMUF=3000&fromDate=1997%2F01%2F01+00%3A00%3A00&toDate=1997%2F12%2F31+11%3A59%3A00";
options = weboptions("ContentType", "text");
data = webread(httpUrl, options);
Iono= array2table(data);

Answer 1

[Jan]

F = "https://lgdc.uml.edu/common/DIDBGetValues?ursiCode=JI91J&charName=foF2,foF1,foE,foEs,hmF2,hmF1,hmE" + ...
    "&DMUF=3000&fromDate=%04d%%2F01%%2F01+00%%3A00%%3A00&toDate=%04d%%2F12%%2F31+11%%3A59%%3A00";
% % -> %%, then 1997 -> %04d

URL = sprintf(F, 1998, 1999)

URL = "https://lgdc.uml.edu/common/DIDBGetValues?ursiCode=JI91J&charName=foF2,foF1,foE,foEs,hmF2,hmF1,hmE&DMUF=3000&fromDate=1998%2F01%2F01+00%3A00%3A00&toDate=1999%2F12%2F31+11%3A59%3A00"

[Salma fathi]

Thank you so much this worked perfectly fine. If you allow me to ask how can we apply the same thing for charachters, for example if we would like to chnage the "ursiCode" from the value "JI91J" to something else, how can we do it all at once?

[Jan]

F = "https://lgdc.uml.edu/common/DIDBGetValues?ursiCode=%s&charName=foF2,foF1,foE,foEs,hmF2,hmF1,hmE" + ...
    "&DMUF=3000&fromDate=%04d%%2F01%%2F01+00%%3A00%%3A00&toDate=%04d%%2F12%%2F31+11%%3A59%%3A00";

URL = sprintf(F, 'QQQQQQ', 1998, 1999)

URL = "https://lgdc.uml.edu/common/DIDBGetValues?ursiCode=QQQQQQ&charName=foF2,foF1,foE,foEs,hmF2,hmF1,hmE&DMUF=3000&fromDate=1998%2F01%2F01+00%3A00%3A00&toDate=1999%2F12%2F31+11%3A59%3A00"

The format %04d prints a number with 4 digits and leading zeros. %s inserts a string or CHAR vector.

You find an exhaustive explanation of the formats at:

doc sprintf

[Salma fathi]

Thank you so much that was so helpful.