HELP PLEASE!! How do I print matlab "1:5 multiply increases each line"

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Ken kaneki
Ken kaneki 2016-1-18
编辑： Stephen23 2016-1-18
This is my code
clc
fprintf (' SGD USD GBP EURO \n')
for (x= 1 : 5)
USD = 0.69 *2;
GBP = 0.49 *2;
EURO = 0.64 *2;
fprintf (' \n %d %.2f %.2f %.2f ' ,SGD ,USD ,GBP ,EURO);
end
My results
SGD USD GBP EURO
1 1.38 0.98 1.28
1 1.38 0.98 1.28
1 1.38 0.98 1.28
1 1.38 0.98 1.28
1 1.38 0.98 1.28 >>
I want the 2nd line to multiple by two, the thrid line to multiple by three... so on and so fourth...

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采纳的回答

Stephen23
Stephen23 2016-1-18
编辑：Stephen23 2016-1-18
Without any loops, using vectorized code. Note that you can simply add new currencies to the arrays and it will work perfectly (i.e. changing the code itself is not required):
% the arrays:
name = {'SGD','USD','GBP','EURO'};
xchg = [ 1, 0.69, 0.49, 0.64];
mult = [1:5,10,20]; % multiples
% the code:
fprintf('%8s',name{:})
fprintf('\n')
fmt = repmat('%8.2f',1,numel(name));
fprintf([fmt,'\n'],xchg(:)*mult)
prints this:
SGD USD GBP EURO
1.00 0.69 0.49 0.64
2.00 1.38 0.98 1.28
3.00 2.07 1.47 1.92
4.00 2.76 1.96 2.56
5.00 3.45 2.45 3.20
10.00 6.90 4.90 6.40
20.00 13.80 9.80 12.80
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Stephen23
Stephen23 2016-1-18
编辑：Stephen23 2016-1-18
My pleasure. Here are a few tips to understand how my solution works:
  1. fprintf keeps repeating its format until it runs out of values to work with: this means that fprintf('%f,',1:3) prints '1,2,3,'.
  2. The minimum total width of the output can be set: fprintf('%4f',1) prints '___1' (three spaces are indicated here by three underscores).
  3. The product xchg(:)*mult calculates all values at once in a matrix. Try it in your command window!
Now you should be able to understand how it works. Of course the fprintf documentation explains how it behaves, that is where I learned how to do these kind of things.
Ken kaneki
Ken kaneki 2016-1-18
Thanks Stephen, i'm slowly digesting it hahaha! I guess it's gonna take awhile...

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更多回答（1 个）

C.J. Harris
C.J. Harris 2016-1-18
Do you mean like this?
clc
fprintf(' SGD USD GBP EURO \n')
for x= 1 : 5
USD = 0.69 * 2 * x;
GBP = 0.49 * 2 * x;
EURO = 0.64 * 2 * x;
SGD = x;
fprintf (' \n %d %.2f %.2f %.2f ' ,SGD ,USD ,GBP ,EURO);
end
Result:
SGD USD GBP EURO
1 1.38 0.98 1.28
2 2.76 1.96 2.56
3 4.14 2.94 3.84
4 5.52 3.92 5.12
5 6.90 4.90 6.40
  1 个评论
Ken kaneki
Ken kaneki 2016-1-18
Thank you guys for your time and offered help to me, really really appreciated. The mistake i made was I didn't add the * x; !!

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