MATLAB: Operands to the || and && operators must be convertible to logical scalar values.

error !! operands to the || and && operators must be convertible to logical scalar values.

Dear All The code that I am working with is separated to sections with function command. After running the code with input parameters this error occurs. (Operands to the and && operators must be convertible to logical scalar values) However, when I insert the values of the parameters inside the code, then running it , I found it is running. I don't want to insert the parameters values in the code directly ,I want to feed the parameters as input as follow: WaRa(1, 9.81, 0.017, 0, 8.8, 15.2, 1, 1, 0, 0, 2, 4, 0, 36.9, 15.2) any suggestion please?

Best Answer

try using

| and &

instead of

|| and &&

since the && is the Short-circuit logical AND while the & operator is element wise logical and.. which might be what you need.. Cannot say with certainty without looking at the code..

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MATLAB: Global Flag

I'd say that Yw is not used, or has no effect, in the internal code of HenXoma (which we can't see because you didn't post it.) Why don't you post it.

If Yw is a global variable (I assume that's what "Glabal" means to you), you don't need to pass it via the argument list, you just declare it global inside the function.

MATLAB: How to run script iteratively

 clc; clear; close all;
          format long 
          Ma=.84
          Ra=.287
          Rg=.287
          siga=1.4
          sigg=1.3333
          Pa=54.05
          Ta=225.7
          OPR=2:3:200
          tsfc=cell(1,67) ;      %PRE-ALLOCATION
          for i = 1:numel(OPR)
          Va=Ma*sqrt(siga*Ra*Ta)
          Cpoa= (siga*Ra)./(siga - 1)
          TINT = 1100:100:1800
          PRC = sqrt(OPR(i))
          % Diffuser
          efd=.93
          To1 = Ta*(1+((siga-1)/2)*(Ma^2))
          Toa=To1
          Po1 = Pa*(1 + efd*((siga - 1)/2)*(Ma^2))^(siga/siga-1)
          Poa=Pa*(Toa/Ta)^(siga/siga-1)
          %Compressors  
          efc=.87
          %Low Pressure
          Po2=Po1.*(PRC)
          To2 = To1 + ((To1*((PRC.^((siga-1)/siga)-1)))/efc)
          WC_LP = Cpoa*(To1-To2)
          %High Pressure
          To3 = To2 + ((To2.*((PRC.^((siga-1)/siga)-1)))/efc)
          Po3=Po2.*(PRC)
          WC_HP = Cpoa*(To2-To3)
          %Combustion
          efb =.98
          deltPob = .4 
          Po4= (1-deltPob)*Po3
          To4=TINT
          %Combustion Calculations for f
          MC=14.4
          MH=24.9
          MO=0
          Ycc=MC + (MH/4)- (MO/2)
          Tp=To4
          Tr=To3
          To= 298
          HRP_to = -8561991.6
          if Tp <= 1600
          hco2p = 56835 + 66.27*Tp + -11634.0*log(Tp)
          hh2op = 88923 + 49.36*Tp + -7940.8*log(Tp)
          hn2p= 31317 + 37.46*Tp + -4559.3*log(Tp)
          ho2p = 43388 + 42.27*Tp + -6635.4*log(Tp)
          else
          hco2p = 93048 + 68.58*Tp + -16979.0*log(Tp)
          hh2op = 154670 + 60.43*Tp + -19212.0*log(Tp)
          hn2p = 44639 + 39.32*Tp + -6753.4*log(Tp)
          ho2p =127010 + 46.25*Tp + -18798*log(Tp)   
          end
          if Tr <= 1600
          hco2r = 56835 + 66.27*Tr + -11634.0*log(Tr)
          hh2or = 88923 + 49.36*Tr + -7940.8*log(Tr)
          hn2r= 31317 + 37.46*Tr + -4559.3*log(Tr)
          ho2r = 43388 + 42.27*Tr + -6635.4*log(Tr)
          else
          hco2r = 93048 + 68.58*Tr + -16979.0*log(Tr)
          hh2or = 154670 + 60.43*Tr + -19212.0*log(Tr)
          hn2r = 44639 + 39.32*Tr + -6753.4*log(Tr)
          ho2r =127010 + 46.25*Tr + -18798*log(Tr)
          end
          hco2 = hco2p-hco2r
          hh2o = hh2op-hh2or
          hn2 = hn2p-hn2r
          ho2 =ho2p-ho2r
          h2oa=30.5
          h2ob=.0103
          co2a=28.8
          co2b=.028
          o2a=27
          o2b=.0079
          fuela= 38.1
          fuelb=.656
          Delt_HRP = (MH/2)*(h2oa*Tr +.5*h2ob*Tr.^2) - (h2oa*To +.5*h2ob*To.^2)+MC*(co2a*Tr +.5*co2b*Tr.^2) - (co2a*To +.5*co2b*To.^2)- Ycc*(o2a*Tr +.5*o2b*Tr.^2) - (o2a*To +.5*o2b*To.^2)-(fuela*Tr +.5*fuelb*Tr.^2) - (fuela*To +.5*fuelb*To.^2)
          HRP =HRP_to + Delt_HRP
          y = (-HRP - MC*hco2 - (MH/2).*hh2o + Ycc.*ho2)./(3.76.*hn2+ho2)
          fideal=197.7./(4.76*y*28.97)
          f=fideal*efb
          %Turbines | HIgh and Low have equal efficiencies 
          eft=.90
          efm=.99
          Cpog = (sigg*Rg)/(sigg-1)
          % High Pressure
          To5= To4 + (WC_HP./(efm*(1+f)*Cpog))
          Po5 = Po4*(1-((1-(To5/To4))/eft))^(sigg/(sigg-1))
          % Low Pressure
          To6= To5 + (WC_LP./(efm*(1+f)*Cpog))
          Po6 = Po5*(1-((1-(To6/To5))/eft))^(sigg/(sigg-1))
          %Nozzle
          %Choke Test
          efn = .95
          P_Po6 = (1-((1/efn)*(1-(2/(sigg+1)))))^(sigg/(sigg-1))
          R=Pa./Po6
          Me=1
          Pe=Po6*(P_Po6)
          Te=To6*(2/(sigg+1))
          roe= Pe./(Rg*Te)
          Ve= Me*sqrt(sigg*Rg*1000*Te)
          % Fs and T.S.F.C Calculations
          Fs = ((1+f).*Ve-Va) + (Pe-Pa).*((1+f)./(roe.*Ve))
          tsfc{i}= (f./Fs).*3600;
          end
          celldisp(tsfc)        %each subcell represents each value of OPR
tsfc = vertcat(tsfc{:})    %double array

Best Answer

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