how to set the evenly spaced yaxis

Hi I have an excel file with 12 columns and I am reading the data and plotting it as follows but I am getting unevenly spaced Yaxis( find the attached figure). Please give me suggestions to overcome it.

data = xlsread('PLOTF1');
x = data(:,1);
y=data(:,2);
loglog(x,y,'k','linewidth',2.0)
hold on
y2 = data(:,3);
loglog(x,y2,'b','linewidth',2.0)
hold on
y3 = data(:,4);
loglog(x,y3,'r','linewidth',2.0)
hold on
y4 = data(:,5);
loglog(x,y4,'b','linewidth',2.0)
hold on
y5 = data(:,6);
loglog(x,y5,'y','linewidth',2.0)
hold on
y6 = data(:,7);
loglog(x,y6,'g','linewidth',2.0)
hold on
y7 = data(:,8);
loglog(x,y7,'m','linewidth',2.0)
hold on
y8 = data(:,9);
loglog(x,y8,'y-.','linewidth',2.0)
hold on
y9 = data(:,10);
loglog(x,y9,'r-.','linewidth',2.0)
hold on
y10 = data(:,11);
loglog(x,y10,'k-+','linewidth',0.2)
hold on
y11 = data(:,12);
loglog(x,y11,'k-.','linewidth',2.0)
hold off
% ylabel('Stress, [MPa]','fontsize',20);
ylabel('NSD(dBVrms/sqrt(Hz))','fontweight', 'bold', 'fontsize',12, 'fontname', 
'arial');
xlabel('Frequency (Hz)','fontweight', 'bold', 'fontsize',12, 'fontname', 'arial');
axis([0 500 -90 -10]);

I have also tried logspace and linespace functions.

[Stephen23]

@nandeesh kumaravelu: what evenly-spaced tick marks do you expect to see on a logarithmic scale between -90 and -10 ?

[NANDEESH]

Hi Stephen, In the plot you see the spacing between -10 and -20 is high

but the spacing in the lower scales -70,-80,-90 are spaced very close

So it is uneven.

I want the equal spacing between all the values

[Stephen23]

@NANDEESH: if you do not want a logarithmic y-scale then you should consider using another command, such as semilogx.

Answer 1

[NANDEESH]

Hi,

I found the answer by changing the code

Instead of using loglog(x,y)

I used plot(x,y) then I set the gca of xaxis to log and yaxis to linear

plot(x,y,'k-.','linewidth',2.0);

set(gca,'YTick',[-90:10:-10]) ;

ax = gca;

ax.YScale = 'linear';

ax.XScale = 'log';

[Stephen23]

@NANDEESH@ using semilogx would be simpler. When you scroll to the bottom of loglog you will find a list of "See Also" functions, which you might like to spend a few minutes reading through the help of.

Answer 2

[KL]

try

yticks([-90:10:-10])

[NANDEESH]

Hi, Thanks for the reply

I tried yticks,

set(gca,'YTick'[-90:10:-10];

but still it is not working

[KL]

Ah, it's a log plot! Did you check a similar question answered by dpb here?

https://www.mathworks.com/matlabcentral/answers/157118-how-to-add-minor-ticks-on-loglog-plot

[NANDEESH]

Thanks a lot KL :-)