Uning Only Interger Values

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JWalker 2018-12-1

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https://ww2.mathworks.cn/matlabcentral/answers/433183-uning-only-interger-values

评论： madhan ravi 2018-12-1

I am trying to index an array based on several values, using another array(Dt). This means I need to make sure all my values in Dt being used to index are interger values so I need to remove the values that are not intergers from Dt. Is there a way to do this directly?

Alternatively as Dt is being generated by Dt = Tf/nSteps; where Tf is a constant and nSteps = 1:1:20; is there a way to insure Dt only takes the interger values of Tf/nSteps?

Any help is appreciated.

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KALYAN ACHARJYA 2018-12-1

Can you explain more with array and index example?

JWalker 2018-12-1

This is the section of code I'm working on currently, It doesn't have variable definitions but here:

for nSteps = 1:1:40

Dt = Tf/nSteps; %Makes Dt step size foe new steps

DtInt = floor(Dt); %Makes Dt Intergers

DtInt= unique(DtInt); %Makes unique intergers

T0=T; %Resets start temp of object

EulerTemp = zeros(1,nSteps);

EulerTime = zeros(1,nSteps);

EulerTemp(1) = T0;

EulerTime(1) = 0;

tstart=0;

for EulerLoop = DtInt:DtInt:Tf

DT = -K*(T0-Te)*Dt;

T0 = T0+DT;

tstart = EulerLoop;

EulerTemp(1+EulerLoop/DtInt) = T0;

EulerTime(1+EulerLoop/DtInt) = tstart;

end

PercentError = abs(EulerTemp-ExactTemp)/ExactTemp;

end

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Answer 1

YT 2018-12-1

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You could use round(), floor(), ceil() to first round the floats to integers and then use unique() to remove possible duplicates

Tf = 500; %constant
nSteps = 1:1:20; %steps
Dt = Tf./nSteps
unique(round(Dt))
ans =
    25    26    28    29    31    33    36    38    42    45    50    56    63    71    83   100   125   167   250   500