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John fredson


Last seen: 3 months ago Active since 2022

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code loop occur errors
m = 0.5; g = 9.81; F = m*g; theta = 0:50 V = sqrt(2*F/m); vertical = V*sin(theta); pve = V_hi > 0; t_pve = theta(pve); ...

4 months ago | 0 answers | 0

0

answers

Question


find data with same name
For this two data file, I need to plot population of each country in population file with correspond death in owid data file , b...

4 months ago | 1 answer | 0

1

answer

Question


how to use read variable
May I know how to obtain column of population using readtable?

4 months ago | 2 answers | 0

2

answers

Question


How to fit regression
I have a equation y = Ae^-Bx, how to polyfit it and find A and B?

4 months ago | 1 answer | 0

1

answer

Question


Question regarding error occured
X = importdata('owid-covid-data_2020-21.csv'); john_data = X.textdata; X_s = string(john_data); data = X.data; d = X_s(:,4...

4 months ago | 0 answers | 0

0

answers

Question


How to find data
Can I ask how to find variables with the same country name, correspond total death, cases and plot it on the graph which in a hu...

4 months ago | 1 answer | 0

1

answer

Answered
plot textdata with NaN
T = readtable('owid-covid-data_2020-21.csv'); id_a = strcmp(X.Location,'a'); T1 = T(id_a,:) ; id_A = strcmp(X.Location,'...

4 months ago | 0

Answered
plot textdata with NaN
X = importdata('owid-covid-data_2020-21.csv'); d_tracked = X.textdata(1:32,5); t_case = X.textdata(1:32,6); t_death = X.textd...

4 months ago | 0

Question


plot textdata with NaN
May I know How to assign a zero to a NaN data in a infinitely long text data how to plot a infitely long text data which cont...

4 months ago | 5 answers | 0

5

answers

Answered
covert NaN to zeros
I have a set of struct data, may I know how can I plot it in the subplot?

5 months ago | 0

Answered
covert NaN to zeros
Check for incorrect argument data type or missing argument in call to function 'isnan'. Error in Q1a (line 16) x(isnan(X))=...

5 months ago | 0

Question


covert NaN to zeros
“These will contain the value ‘NaN’ when imported. You should replace these with a value of zero.“ For a given set of data, it c...

5 months ago | 3 answers | 0

3

answers