# bnbfreak

8 questions

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### How to convert recursion to iteration way of branch and bound algorithm in Matlab

I have a problem in converting branch and bound algorithm from recursive to iterative method. The code for recursive method is as below: function [xx,val,status,bb]=bnb(f,A,b,Aeq,beq,lb,ub,x,v,M,e,bound) [x0,val0,status0]=linprog(f,A,b,Aeq,beq,lb,ub,[],options); if status0 bound ... return end i...
bnbfreak

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### How can 2 wireless interfaces be handled by single carl9170 device driver module

I want to understand the performance of one device driver module in linux kernel. In this case I use carl9170 device driver in linux. If I use two physical interfaces, how can the single module carl9170 handle 2 different physical interfaces? Because so far, I have known that these 2 physical interf...
bnbfreak

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### Capturing certain value from iperf result using grep

I use iperf3 version and then I get the performance result like this in terminal : [ 4] local 10.0.1.8 port 34355 connected to 10.0.1.1 port 5201 49,49,0,0,35500 [ ID] Interval Transfer Bandwidth Retr Cwnd [ 4] 0.00-1.00 sec 2.19 MBytes 18.4 Mbits/sec 0 69.3 KBytes...
bnbfreak

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66

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### Find gradient from complicated objective function in Matlab

I have a problem in calculating symbolic gradient from the following objective function: syms x gradient(@objfun,x) function f = objfun(x) N = 4; I = 3; fr = 5; f_temp = 0; for n=1:N sum2 = 0; for i=1:I sum1 = fr*(1 - x(n+((i-1)*N))); sum2 = sum2 + sum1; end f_temp = f_temp + sum2; end f = 100*f_t...
bnbfreak

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62

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### Pass / copy pointer to another pointer

I have a pointer code as follows : class NsObject : public TclObject, public Handler { public: NsObject(); virtual ~NsObject(); virtual void recv(Packet*, Handler* callback = 0) = 0; virtual void recv(Packet* p, const char* s); } NsObject* uptargetTX; NsObject* uptarget_; void NsObject::recv(Pa...
bnbfreak

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### Correct syntax for floating number comparison in bash script [duplicate]

This question already has an answer here: How to compare two floating point numbers in Bash? 15 answers I have a problem to make command from this condition in bash script since bash script doesn't support float number. if ([ \$first_util -gt 0.10 ] || [ \$first_util -le 1.00 ]) && [ \$first_sig -ge \$...
bnbfreak

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78

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### Dynamically fixing some variables when using fmincon

I have a MINLP objective function and I want to fix some variables value into constant as an example described below: A = [1 1 1]; b = 30; x1 = zeros(1,3); y=1; x = fmincon(@(x)objfun(x,y),x1,A,b); function f = objfun(x,y) x(y) = 1; f = x(1)^2 + x(2)^2 + x(3)^2; end However, the result of variable x...
bnbfreak

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