# How to make the variable pace, a data type double

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B on 1 Sep 2021
Commented: Stephen on 1 Sep 2021
I am trying to make a function that gives me the pace required given an athletes goal
function pace = required_pace(time,distance) % time = [hrs,mins,secs] distance = km
time=floor(time)
a=time/distance
pace=duration(a,'Format','hh:mm:ss')
end
% Calling the function
time=[0,33,3] % the altheltes goal times
distance=10 %km
required_pace(time,distance)
% i get pace=0:3:18 per km
So, i think i got the right answer but i am required to have the variable pace be a data type double and i am not sure how i am meant to write the function code to get that

Stephen on 1 Sep 2021
Edited: Stephen on 1 Sep 2021
T = [0,33,3]; % the atheletes goal time [H,M,S]
D = 10; % km
P = required_pace1(T,D)
P = 1×3
0 3.0000 18.3000
class(P)
ans = 'double'
P = required_pace2(T,D)
P = 1×3
0 3.0000 18.3000
% Using DURATION:
function pace = required_pace1(time,distance) % time = [H,M,S], distance = km
durn = duration(time,'Format','hh:mm:ss.SSSSSSSS');
pace = sscanf(char(durn/distance),'%f:',[1,Inf]);
end
% Without DURATION:
function pace = required_pace2(time,distance) % time = [H,M,S], distance = km
secs = [60*60,60,1]*time(:);
temp = secs/distance;
pace = nan(1,3);
pace(3) = mod(temp,60); % seconds
temp = fix(temp/60);
pace(2) = mod(temp,60); % minutes
temp = fix(temp/60);
pace(1) = temp; % hours
end
##### 2 CommentsShowHide 1 older comment
Stephen on 1 Sep 2021
"for future reference could you explain to me what line ... "
sscanf(char(durn/distance),'%f:',[1,Inf]);
% ^^^^^^^^^^^^^ divide duration by distance
% ^^^^^ ^ convert duration to character
%^^^^^^ ^^^^^^^^^^^^^^ convert character to double
You can easily see the intermediate results yourself by printing them to the command window.

Matt J on 1 Sep 2021
pace=time/distance
B on 1 Sep 2021
yeah i have done that before but i get
pace=[0,3.3,0.3]
%what i need is
pace=[0,3,18.3]%[hrs,mins,sec]

R2021a

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