inputing multiple variables into a for loop in matlab

Question

When i'm running this code in matlab, it is printing the g4 value into the array columns were g3 and its calculated value is suppose to be, as well as its own column. I was just wondering how to stop g4 being placed into g3's column and instead, print g3 and its value in the two arrays.

Cheers

v_meas = 0;
g1 = 1.09;
g2 = 0.9;
g3 = 0.93;
g4 = 0.85;
radius = 3.75;
K = 0.006;
m = g1;
g = g3;

for ii = 1 : 1 : 2
    v_meas = m*((radius^2)*pi)*K;
    ArrayOfDarceys(1,ii) = v_meas;
    ArrayOfGradients(1,ii) = m;
    v_meas = 0;
    m = g2;
    for jj = 3 : 1 : 4
         v_meas = g*((radius^2)*pi)*K;
         ArrayOfDarceys(1,jj) = v_meas;
         ArrayOfGradients(1,jj) = g;
         v_meas = 0;
         g = g4;
    end
end
ArrayOfDarceys
ArrayOfGradients

Could you post the output (please, no screenshots) as well and highlight where it has gone wrong, please... — kkuilla
– kkuilla, Commented Sep 2, 2015 at 9:32
The 3rd value in the arrayofgradients should be 0.93, not 0.85. Also the third value in the arrayofdarcys should be the value for 0.93, not 0,85. ArrayOfDarceys = 0.2889 0.2386 0.2253 0.2253 ArrayOfGradients = 1.0900 0.9000 0.8500 0.8500 — James Matthews
– James Matthews, Commented Sep 2, 2015 at 10:16
Could you update the post, please rather than the comments. — kkuilla
– kkuilla, Commented Sep 2, 2015 at 10:54

RPM · Accepted Answer · 2015-09-02 09:55:40Z

2

I suspect you didn't intend to nest your for loops. Try this:

for ii = 1 : 1:  2
    v_meas = m*((radius^2)*pi)*K;
    ArrayOfDarceys(1,ii) = v_meas;
    ArrayOfGradients(1,ii) = m;
    v_meas = 0;
    m = g2;
end
for jj = 3 : 1: 4
     v_meas = g*((radius^2)*pi)*K;
     ArrayOfDarceys(1,jj) = v_meas;
     ArrayOfGradients(1,jj) = g;
     v_meas = 0;
     g = g4;
end

If I understand what you are trying to do you could significantly simplify your code though. There is, in fact, no need for any for loops:

ArrayofGradients = [1.09,0.9,0.93,0.85]
ArrayofDarceys = ArrayofGradients*((radius^2)*pi)*K

answered Sep 2, 2015 at 9:55

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1 Comment

GameOfThrows Over a year ago

yes, I suspect this is the problem as well. +1 from here.

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