MATLAB: How to compare the values of different columns of the same matrix

columnsequalMATLABmatrix

I want to compare the values of the vector/matrix ZL with eachother. This is my code. It always displays false even if the values are equal

 ZL=input('ZA ZB ZC ','s');
if ZL(1,1)==ZL(1,2)==ZL(1,3)
   display('True')
else display ('false')
  end

Best Answer

Basically, the function input with the argument 's' returns a char array (string), you need to convert it into vector of numbers, like this:

 ZL=input('ZA ZB ZC ','s'); % this is returning a char array
 ZL = sscanf(ZL,'%f')'; % add this line to break the char array into vector of numbers
 % the transpose (') at the end is to get a row vector instead of column vector
if ZL(1,1)==ZL(1,2)==ZL(1,3)
   display('True')
else display ('false')
  end

Related Solutions

MATLAB: How to load multiple files and do the computation for each of them and write the output in consequent rows

Your loop will want to start with grabbing all files in a folder. uigetfile with the MultiSelect option will work wonders here:

[Name,Path]=uigetfile({'*.xlsx*'},'MultiSelect','on');
entirefile=fullfile(Paths,Names);

Then start your loop. It wants to run a number of times equal to the number of elements in your entirefile cell, as you also have in your own code. Within this loop, do all your loading, calculation and writing. To avoid cluttering the workspace, you might want to look into a structure and dot indexing.

for i=1:numel(entirefile);
    %your entire code including
    enginedata(i).raw=importdata(entirefile{i});
    enginedata(i).temperature = your temperature calculation
    enginedata(i).oilpressure = oil pressure calculation
    %and so on
    %finally, to write in consecutive fields the results, simply keep indexing your things:
    celltarget=['B',num2str(i)]; %B1 first run, B2 2nd run etc. 
    writecell(mean_engine_temperature,filename,'Sheet','Temperatures','Range',celltarget);
end

MATLAB: How to create a table containing all iterations

To create a table, store every instance of iter, xr, func(xr), and es at each iteration into a list that is globally and append each iteration to it. Refer to the following code on how to do it:

function[root,ea,iter]=secant(func,delta,xr,es,maxit,varargin)
if nargin<3,error('atleast 3 input arguments required'),end
if nargin<4|isempty(es),es=0.0001;end
if nargin<5|isempty(maxit),maxit=50;end
itr =[];
xr =[];
func_xr =[];
es =[];
iter=0;
while (1)
    xrold=xr;
    xr=xr-((delta*xr*func(xr))/(func(xr+(delta*xr))-func(xr)));
    iter=iter+1;
    if xr~=0, ea=abs((xr-xrold)/xr)*100;end
    if ea<=es|iter>=maxit,break,end
  funcxr=func(xr);  
  itr(i) = iter;
  xr(i) = xr;
  func_xr(i) = funcxr;
  es(i) = es;
end

Best Answer

Related Solutions

MATLAB: How to load multiple files and do the computation for each of them and write the output in consequent rows

MATLAB: How to create a table containing all iterations

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