Matlab

Matlab Tricks

1. Save figure in high resolution

H=figure(1)

sc_sz = get(0,'ScreenSize');

set(H, ...

    'PaperPositionMode', 'manual', ...

    'PaperUnits', 'inches', ...

    'PaperPosition', [0 0 sc_sz(3)/100 sc_sz(4)/100])

print(H, '-dpng', '-r1000');

or

save EMF ( Enhanced metafile)  format

2. Multiple Boxplots

index= 1;

for i= 1: length(data(:,1))

    tempdata= data{i,1}(:,5); %data to be plotted

    tempdata = tempdata (~isnan(tempdata));

    for j = 1 : length(tempdata)

        matToPlot(index,1) = tempdata(j);

        groupVector(index,1) = i;

        index = index+1;

    end

end

boxplot(matToPlot,groupVector,'colors',[0.6 0.6 0.6]);

h=findobj(gca,'tag','Outliers');

delete(h)%outlier delete

3. Put text in image

gtext('Cauvery')

4. Insert a color background layer

p=patch([0 40 40 0],[151 151 273  273],'k');

set(p,'FaceAlpha',0.05)

set(p,'EdgeAlpha',0.3)

hold on

5. Plot Timeseries

colour_teal=[20 239 144] ./ 255;

plot(1:lengt,keep_ori,'Color',colour_teal,'LineStyle','-','LineWidth',1.5,...

 'Marker','o', 'MarkerSize',2);

choose colour here

6. Save large data

save('India_data','India_data','-v7.3');

7. Plot Design

set(gca,'Xtick',[1,2,3,4])

ylim([1 366])

xlim([0 34])

set(gca,'YTick',[1,31,59,90,120,151,181,212,243,273,304,334,366])

set(gca,'ticklength',0.5*get(gca,'ticklength'))

set(gca,'XTick',([]))

8. Set Legend Properties

hLegend = legend(LegHandles,LegText,'Orientation', 'vertical', 'FontSize', 9, 'Location', 'northeast');

set(hLegend,'Interpreter','none','FontSize',7.5);%changes legend size also

set( hLegend,'color','none'); %transparent background

legend boxoff % transparent background + no box

%precise position of legends

leg_pos = get(hLegend,'position') ;

set(hLegend,'position',[leg_pos(1)+0.2*leg_pos(3),leg_pos(2),...

                       leg_pos(3)*0.8,leg_pos(4)]) ;

9. Save figures in loop

for i=1:32

h=figure(i);

Data=AM(:,i+1);

time=AM(:,1);

plot(time,Data,'LineStyle','-','LineWidth',1.5,...

 'Marker','o', 'MarkerSize',2);

saveas(h,sprintf('CDF%d.png',i)

end

10. Remove Zero value rows

New_DATA = DATA(DATA(:,1)~=0,:);

New_DATA = DATA(~isnan(DATA));

11. Some Random Number Generation

m = datasample(1:100,5,'Replace',false)'; % Randomly select without replacement ex: Upper Limit=100; data required=5

n = repelem(1:5,RV); % Repeated Number generation ex: RV=[1,1,2,1,1] Vector of Repeatation No  3 twice

x = n(randperm(length(n))); % Random suffling

Cel = randi([1, size(x,2)-1],1,1); % A random cell position in a row

y = reshape(x,[2,length(x)/2])'; % Reshape any matrix

ran = (1-(-1)).*rand(1,1)-1; % random no in [1,-1] (UL-LL).rand(row,col)-UL

InterD = pdist2(pointVec,centerVec,'euclidean')'; % ||pointVec-centerVec||

12. Some 3D Plotting

% Plotting 1

scrsz = get(groot,'ScreenSize');figure('Position',scrsz);M=zeros(20,15);

for i=1:20

    N=rand(1,15);

    M(i,:)=N;

    surf(M);az =72;el =82; view(az, el);hold on;

    title(sprintf('Time %i seconds',i));

    xlabel('xSpace');ylabel('ySpace');zlabel('Height');

    pause(0.15);getframe(gcf);

end

hold off;surf(M);az =72;el =82; view(az, el);colorbar('AxisLocation','in')

% Plotting 2

pause(2);mesh(M);az =72;el =82; view(az, el)


pause(2);pcolor(M);xlabel('time');ylabel('space');title('Colour Map');colorbar('southoutside')

pause(2);contour(M);xlabel('Time');ylabel('Space');title('Contour');colorbar('southoutside')

pause(2);contourf(M);xlabel('Time');ylabel('Space');title('Colour Contour');colorbar('southoutside')

13. Avoid 'FOR LOOP'

% Matrixwise Average Calculation | Data Generation

for j=1:5
    C{j,1}=rand(3,7);
end
% Calculation
ChangeDim=cat(3,C{:}); % Creating higher dimensional matrix
AMW=mean(ChangeDim,3); % Average Matrix Wise

% Creating Matrix with row wise sum to 1

p=rand(7,3); % Data Generation
FM=bsxfun(@rdivide,p, sum(p,2)); % Calculation