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Use fprintf for data from a table

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jacob Mitch
jacob Mitch on 13 Oct 2019
Commented: Star Strider on 13 Oct 2019
if I have data from a mat file say
3 7 2005 30 %1st 3 columns are day month year print loss
1 4 2005 35
1 5 2005 24
2 6 2005 25
.....
% I have code that gets the data I want say index= [1;2;4] and values=[10;20;30] Id like to print the date and value corresponding
%the index and value
How would I use fprintf or disp to get something like
'One of the 3 big losses occurs on the 3rd of July 2005 with a loss of 30' %Is it possible to write it as something like
'One of the 3 big losses occurs on the data(i,index(1)) of data(i,index(2)) data(i,index(3)) with a loss of values(3)'

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Accepted Answer

Star Strider
Star Strider on 13 Oct 2019
Try this:
M = [3 7 2005 30
1 4 2005 35
1 5 2005 24
2 6 2005 25];
MDate = datetime(M(:,3),M(:,2),M(:,1));
% MDates = cellstr(MDate); % Optional
for k = 1:size(M,1)
fprintf('One of the 3 big losses occurs on %s with a loss of %d\n', MDate(k), M(k,4))
end
The loop is necessary, since fprintf has different variable types (datetime and double) in its arguments.

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Star Strider
Star Strider on 13 Oct 2019
My pleasure.
So long as ‘index’ are integers greater than 0 and address existing rows in ‘M’, this will work:
index = [1;2;4];
value = [30;35;25];
for k = 1:numel(index)
fprintf('One of the 3 big losses occurs on %s with a loss of %d\n', MDate(index(k)), value(k))
end
(I did not re-post ‘M’ and ‘MDate’ here. I assume they already exist in your workspace.)
jacob Mitch
jacob Mitch on 13 Oct 2019
This is absolutely perfect, thank you so much
Star Strider
Star Strider on 13 Oct 2019
As always, my pleasure!

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