array indices must be positive integers or logical values.

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i am getting this error

Array indices must be positive integers or logical values.
Error in tabular/dotParenReference (line 108)
        b = b(rowIndices);
Error in tryout (line 12)
 z1 = sum(y.resource (p:T).^2)

for the following lie of code

z1 = sum(y.resource (p:T).^2)

here i would be taking values from variable resource in table y, for which sum till end day of project(t) whose square is found.

i hope this explains the above line from code.

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Walter Roberson 2019-10-14

That suggests that p is not a positive integer.

aarthy reddy R 2019-10-14

在 MATLAB Online 中打开

function[fitness_value] = tryout(x)
T = 18;     %total number of days to complete project
oo = readtable ('datasheet.xlsx');
 x1 = round(rand() );
 p  = bin2dec(num2str(x1))
 x2 = round(rand() );
 q  = bin2dec(num2str(x2))
 x3 = round(rand() );
 r  = bin2dec(num2str(x3))
	
 z1 = sum(resource (p:T).^2)
 z2 = sum(resource (q:18).^2)
 z3 = sum(resource (r:18).^2)
 A = [ z1 z2 z3 ];
  fitness_value = max(A);
  
  fitness_value = -1 * fitness_value;
end 

this the code, here the value taken is binary so cannot be non positive

any suggestions please

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Answer 1

John D'Errico 2019-10-14

编辑：John D'Errico 2019-10-14

在 MATLAB Online 中打开

0 个投票

p is sometimes zero. sometimes it is one. how you are creating p is a bit silly, as there is absolutely no reason to use bin2dec, and num2str is also a bit over the top. For example, I tried it twice, and I see:

>> x1 = round(rand() );
 p  = bin2dec(num2str(x1))
p =
     1
>>  x1 = round(rand() );
 p  = bin2dec(num2str(x1))
p =
     0

But then you have the line:

z1 = sum(y.resource (p:T).^2)

if sometimes p is zero, then you create a vector p:T. Whenever p is zero, then p:T will be a vector that STARTS at zero.

When p is zero, can you use that vector as an index into the variable y.resource?

NO.

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aarthy reddy R 2019-10-14

thank you so much your explanation is of great help

i have a doubt i have to choose different values for p but it must be less then 18

so i can do square of resources from that day till end

so i used rand funtion

can u provide any suggestions?

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