MATLAB Answers

Excel I/o matlab

143 views (last 30 days)
Priyamvada Shankar
Priyamvada Shankar on 24 Mar 2019
The attached Distances.xlsx file contains a spreadsheet with the pairwise distances in miles of the top 100 US cities by population. A preview of the spreadsheet is shown below. The first row and first column contain the city names using the following format: city name comma space capitalized state abbreviation, e.g., Nashville, TN. Note that the very first cell of the spresheet, A1, is blank. Write a function called get_distance that accepts two character vector inputs representing the names of two cities. The function returns the distance between them as an output argument called distance. For example, the call get_distance('Seattle, WA','Miami, FL') should return 3723. If one or both of the specified cities are not in the file, the function returns -1. Preview of the first five cities of Distances.xlsx
  20 Comments
Walter Roberson
Walter Roberson on 29 Aug 2020
Neither q nor w are given (not passed in by the user, not prompted for). Both of them are calculated.
Notice this particular part of the assignment:
"If one or both of the specified cities are not in the file, the function returns -1."
Therefore we cannot assume that the cities passed in will definitely be in the file, so we cannot assume that the positions q or w will have been set to valid values. Testing q and w is checking to be sure that the cities were actually found.

Sign in to comment.

Answers (5)

Irfan Hussain
Irfan Hussain on 1 Apr 2020
function distance = get_distance(city_1 , city_2)
[num,txt,raw] = xlsread('Distances.xlsx');
p = 0; q = 0;
name_1 = strcmpi(city_1,raw(:,1));
p = find(name_1 == 1);
name_2 = strcmpi(city_2,raw(1,:));
q = find(name_2 ==1);
if p > 1 && q > 1
distance = raw{p, q};
else
distance = -1;
end
  5 Comments
Rohit Singh Chauhan
Rohit Singh Chauhan on 21 Sep 2020
function distance = get_distance(city1,city2)
[~, ~, everything] = xlsread('Distances.xlsx');
[row col] = size(everything);
c1 = 0;
c2 = 0;
for ii = [1:row]
c1_row = everything{ii,1};
if strcmp(c1_row,city1)
c1 = ii
end
end
for jj = [1:col]
c2_col = everything{1,jj};
if strcmp(c2_col,city2)
c2 = jj
end
end
if (c1==0 || c2==0)
distance = -1
else
distance = everything{c1,c2}
end
end

Sign in to comment.


SAMARTH MAHESHKUMAR GEMLAWALA
This is how i done it using for loop, make it simple to understand.
function distance = get_distance(a,b)
[num,txt,raw] = xlsread('Distances.xlsx');
x = size(raw)
v = a
c = b
for i=2:x(1,1)
y = raw{1,i};
if strcmp(y,v)
g=1
for j= 1:x(1,2)
z = raw{j,1};
if strcmp(z,c)
f=1
distance = raw{i,j};
break
else
distance = -1;
end
end
break
else
distance = -1;
end
end

Mulayam Singh Choudhary
Mulayam Singh Choudhary on 18 Jun 2020
Edited: Mulayam Singh Choudhary on 18 Jun 2020
function distance=get_distance(a,b)
a= convertCharsToStrings(a);
b= convertCharsToStrings(b);
[bar,~,raj]=xlsread('Distances.xlsx');
ii=2;
for k=1:length(raj)-1
raj{1,ii}= convertCharsToStrings(raj{1,ii});
raj{ii,1}= convertCharsToStrings(raj{ii,1});
ii=ii+1;
end
ii=2;
jj=2;
for m=2:length(raj)
if raj{1,ii}==a
break;
end
ii=ii+1;
end
for n=2:length(raj)
if raj{jj,1}==b
break;
end
jj=jj+1;
end
if ii>length(raj)||jj>length(raj)
distance=-1;
else
distance=bar(jj-1,ii-1);
end

Prince Raj Yadav
Prince Raj Yadav on 26 Jul 2020
Get_Distance
function distance = get_distance(a,b)
[~,~,raw] = xlsread('Distance.xlsx');
[row,col] = size(raw);
for i = 2:row
if strcmp(raw{i,1},a) == 1
break;
else
i = 1;
end
end
for j = 2:col
if strcmp(raw{1,j},b) == 1
break;
else
j = 1;
end
end
if i > 1 && j > 1
distance = raw{i,j};
else
distance = -1;
end
end
  1 Comment
Rik
Rik on 26 Jul 2020
Same here. You don't add any comments, nor do you provide any reasons for the functions you're using. Why did you bother post this? (these are not meant as rhetorical questions)

Sign in to comment.


Sravani Kurma
Sravani Kurma on 28 Jul 2020
Edited: Sravani Kurma on 28 Jul 2020
code with explaination:
function distance=get_distance(alpha,beta)
[~,~,d]=xlsread('Distances.xlsx');% to read values
[m,n]=size(d);% to find the size of d interms of matrix dimensions mxn
s=strcmp(alpha,d(1,1:n));% comparing each string of one row of sheet with given name of the city say alpha
p=(sum(s==1));% aftr comparing output will be logical 1 or 0, so, we get max one logical 1 value and all other zeros ,so sum will be 1+n(0)=1
if p==0 %if p==0,no matching city,,,
distance= -1;
return
end
t=strcmp(beta,d(1,1:m));
q=(sum(t==1));
if q==0
distance= -1;
return
end
distance=d{find(s==1),find(t==1)};%find will given the index value of t==1 and s==1
  4 Comments
Sravani Kurma
Sravani Kurma on 28 Jul 2020
Ok..tq

Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!