a question about plotting

Question

Johnny 2019-12-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/495515-a-question-about-plotting

评论： FraFal 2019-12-8

Q.

I have many S seperately with different on lines on the plot, lines with different k have different colours and shapes. I change the coding to make it more efficient, but now I have no idea how to have a same plot of my original one.

1/ my original codes for S and k, and my original plotting codes

I = 1:100

k03 = 0.3

k1 = 1

k3 = 3

k5 = 5

k8 = 8

k13 = 13

k15 = 15

k18 = 18

k23 = 23

k25 = 25

k28 = 28

S03F = k03*log(I)

S1F = k1*log(I)

S3F = k3*log(I)

S5F = k5*log(I)

S8F = k8*log(I)

S13F = k13*log(I)

S15F = k15*log(I)

S18F = k18*log(I)

S23F = k23*log(I)

S25F = k25*log(I)

S28F = k28*log(I)

figure(1)

hold on

plot(S03F,'co-','markersize',3,'Displayname','k<1');

plot(S1F,'gs-','markersize',3,'Displayname','k=1');

plot(S3F,'gs-','markersize',3,'Displayname','k=3');

plot(S5F,'gs-','markersize',3,'Displayname','k=5');

plot(S8F,'gs-','markersize',3,'Displayname','k=8');

plot(S13F,'md-','markersize',3,'Displayname','k=13');

plot(S15F,'md-','markersize',3,'Displayname','k=15');

plot(S18F,'md-','markersize',3,'Displayname','k=15');

plot(S23F,'rp-','markersize',3,'Displayname','k=23');

plot(S25F,'rp-','markersize',3,'Displayname','k=25');

plot(S28F,'rp-','markersize',3,'Displayname','k=28');

title({'Stevens Law:Power Function'...

'\fontsize{9}Relaitionship Between Subjective and Actual Stimulus Magnitude'...

'\fontsize{9}\color{blue} Under Various k Value'});

lgd = legend ('Location','northwest');

lgd.NumColumns = 4;

lgd.FontSize = 6;

hold off

2. the codes now for S and k

I = 1:100;

kV = [0.3;1;3;5;8;13;15;18;23;25;28];

SV = kV.*log(I)

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Answer 1

FraFal 2019-12-8

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此回答的直接链接

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Hi,

if you want to mantain your plot design, you can indexing your array. As example:

figure(1); hold on:

plot(SV(1), 'co-','markersize',3,'Displayname','k<1');

plot(SV(2),'gs-','markersize',3,'Displayname','k=1');

...

hold off

BR,

FraFal

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Johnny 2019-12-8

Thank you for your answer.

Follow is the coding follow your instructions. The result of the graph has no lines but one dot in the middle. Is there anything I did wrong?

hold on

plot(SV(1), 'co-','markersize',3,'Displayname','k=0.3');

plot(SV(2),'gs-','markersize',3,'Displayname','k=1');

plot(SV(3),'gs-','markersize',3,'Displayname','k=3');

plot(SV(4),'gs-','markersize',3,'Displayname','k=5');

plot(SV(5),'gs-','markersize',3,'Displayname','k=8');

plot(SV(6),'md-','markersize',3,'Displayname','k=13');

plot(SV(7),'md-','markersize',3,'Displayname','k=15');

plot(SV(8),'md-','markersize',3,'Displayname','k=18');

plot(SV(9),'rp-','markersize',3,'Displayname','k=23');

plot(SV(10),'rp-','markersize',3,'Displayname','k=25');

plot(SV(11),'rp-','markersize',3,'Displayname','k=28');

title({'Fechner Law:Logarithmic Function'...

'\fontsize{9}\Relaitionship Between Subjective Magnitude and Actual Stimulus Magnitude'...

'\fontsize{9}\color{blue} Under Various k Value'});

xlabel ('Acual Stimulus Magnitude');

ylabel ('Subjective Magnitude');

lgd = legend ('Location','northwest');

lgd.NumColumns = 4;

lgd.FontSize = 6;

hold off

FraFal 2019-12-8

yes, sorry. Your output data is a matrix (it's a product-vector between 2 arrays).

In this way, you plot only one point/data of the array. If you want to plot data of each array, you have to define something like that: SV(: , 1) ...or SV(1,:).. depending on how your matrix data was defined. In this way for each row/column, you plot the respective column/row.

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